AryabhaTa (in the AryabhaTIyam, and otherwise) dealt with huge numbers in kAlakriyapAda or time measurement and gOlapAda or astronomical (literally Sphere) measurement  like the number of days in a chaturyuga, the diameter of earth, the diameter of the sun... well ginormous numbers, basically.
Apparently, there was no place value number system in place at the time of AryabhaTa  or if there was, he wanted an alternate number representation system, so those numbers could be woven into shlOka meter.
What does the smart guy do? He goes and designs a number representation system (quite possibly the precursor of the Indian Numeral Place Value system), so he could represent these huge numbers, incorporate them into shlokas [actual numerals such as 0,1,2,etc even if they were in use at the time, would mess up the meter], and write numbers sensibly and readably.
He lays out the entire system in one shlOka (#2) in the daSagItikapAda:
वर्गाक्षराणि वर्गे अवर्गे अवर्गाक्षराणि कात् ङमौ यः ।Walter Eugene Clark (I generally look at western translations of संस्कृतम् with a fistful of salt and a few kilograms of suspicion) translates this thus:
खद्विनवके स्वरा नव वर्गे अवर्गे नवान्त्यवर्गे वा ॥
Beginning with the ka the varga letters (are to be used) in the varga places, and the avarga letters (are to be used) in the avarga places. ya is equal to the sum of ~ga and ma. The nine vowels (are to be used) in two nines of places varga and avarga. navAMtyavarge vA
[Note: Clark uses Roman notation with accents, I have used Baraha notation for simplicity.]
The first line and it seems to be accurate enough, but I get the feeling that Clark glosses over the second line.
With the 20:20 hindsight of Clark's and Shukla's translations and Shukla's explanation based on treatises of bhAskara, paramESvara, and others and the practices of the time, I would put a word to word translation [I confess that my training in संस्कृतम् is rudimentary and as indicated, I am only doing this with said hindsight] as:
Example
Kripa Shankar Shukla does a better job with the second line (although it is a bit overly verbal with inaccurate punctuation, and thus ends up as a somewhat confused explanation; it actually makes sense, though, after reading it a few times and seeing Shukla's explanation) translates this as:
The varga letters (ka to ma) (should be written) in the varga places and the avarga letters (ya to ha) in the avarga places. (The varga letters take numerical values 1,2,3,etc.) from ka onwards; (the numerical value of the initial avarga letter) ya is equal to ~ga plus ma (i.e., 5+25). In the places of the two nines of zeros (which are written to denote the notational places), the nine vowels should be written (one vowel in each pair of the varga and avarga places). In the varga (and avarga) places beyond (the places denoted by) the nine vowels too (assumed vowels or other symbols should be written, if necessary).
[Note: Shukla also uses Roman notation with accents, which I have replaced with Baraha notation. The emphasis is also mine to keep the translation separate from the explanation in parentheses. It might need a reread of just the bold portion for the translation]
Apparently (as explained by Shukla), the real interpretation has its roots in the way numbers were represented in ancient bhAratavarSha, and how the the vargas are in units place and avargas are in 10s place, which is why the vargas increase in units, and the avargas increase in 10s. Also, it is clearly stated that the sequence starts with क, and the value of य is stated as ङमौ = ङ + म = 5 + 25 = 30
Also, the 'two nines of zeros' for the 'nine vowels' indicates a, i, u, Ru, ~lu, e, ai, o, au are in the places of two nines of zeros  in other words, units place (10^{0}) to the 10 quadrillion (10^{16}). The svaras are written 'in the places beyond' the varga/avarga which is taken to mean that they supply a multiplying value to the varga/avargas.
This makes it clear that the idea of Zero was prevalent at the time of AryabhaTa, even if the place value system may or may not have been.
With the 20:20 hindsight of Clark's and Shukla's translations and Shukla's explanation based on treatises of bhAskara, paramESvara, and others and the practices of the time, I would put a word to word translation [I confess that my training in संस्कृतम् is rudimentary and as indicated, I am only doing this with said hindsight] as:
The varga letters in varga places and in the avarga places, the avarga letters starting from क, with य [the sum of] ङ and म.
Of the svaras [placed] on [two rows of] nine zeroes which are in the varga and avarga places, the nine that are in the varga places follow.
I realize that this doesn't make a whole lot of sense asis, but it is an attempt at a direct translation of AryabhaTa's shlOka which itself leaves some things out for interpretation. The first line is pretty straightforward. The second line where the svara multiplying factor is explained is much more confusing as it is in both Clark's and Shukla's cases. Reading the translation after knowing how the system works makes somewhat better sense than trying to interpret the system from the shlOka translation.
Based on interpretation, and AryabhaTa's own usage and that of the others after him, the salient features of this system work out as:
Based on interpretation, and AryabhaTa's own usage and that of the others after him, the salient features of this system work out as:
1. varigIya vyaMjanas क to म are assigned values according to place
 Starts with a 1 for क and increments by 1 for each letter.
 The last one is म with the value 25.
2. avarigIya vyaMjanas start with ya being denoted as म + ङ
 य = म(25)+ ङ(5) = 30
 These increment by 10, and go on up to ह (=100)
3. svaras multiply the vyanjanas in incrementing powers of 10, starting with अ = 10^{0}
 The powers increment by 2 for successive svaras
 dhIrGas are not used. Ostensibly these can be fit in to match meter, with no change in value
 Both ऋ and ऌ are present.
 By themselves, svaras do not have any numerical value.
So, the AryabhaTa system resolves itself to:
अ

इ

उ

ऋ

ऌ

ए

ऐ

ओ

औ

10^{0}

10^{2}

10^{4}

10^{6}

10^{8}

10^{10}

10^{12}

10^{14}

10^{16}

क

ख

ग

घ

ङ

1

2

3

4

5

च

छ

ज

झ

ञ

6

7

8

9

10

ट

ठ

ड

ढ

ण

11

12

13

14

15

त

थ

द

ध

न

16

17

18

19

20

प

फ

ब

भ

म

21

22

23

24

25

य

र

ल

व

श

ष

स

ह

30

40

50

60

70

80

90

100

Example
With this system, 3963 can be represented as:
3693 = यिचिसग
vyaMjana  Value  svara  Value  Composite 
Value

य

30

इ

10^{2}

यि

30 * 10^{2} = 3000 
च

6

इ

10^{2}

चि

6 * 10^{2} = 600 
स

90

अ

10^{0}

स

90 * 10^{0} = 90 
ग

3

अ

10^{0}

ग

3 * 10^{0} = 3 
Notice that this has the same number of 'digits' (4) as the standard (Indian numeral) notation. The order of 'digits' is unimportant, since चिगसयि or सगयिचि or गसचियि will all result in a value of 3693.
The same number in Roman notation (another oldworld system) would be:
MMMDCXCIII
Wow! That took quite some writing.
More examples:
* 62,842 = चुनिजिरख
(Roman for this would be ~75 characters long, and therefore unreadable)
* 57,753,336 = लृछृशुङुयिगियच
(It is virtually impossible to write this number in Roman in a way that makes sense)
According to AryabhaTa, this is the number of moon 'revolutions' in a yuga, and he writes it as चयगियिङुशुछ्लृ
[From this, it appears as if halfletter followed by a letter with a vowel applies that svara (vowel) to both letters  the half letter and the second letter containing the svara. Another aid in metering shlOkas. In this case the complex letter of half छ and ल with ऋ vowel, छ्लृ, having the value of 50,000,000 + 7,000,000 = 57,000,000]
Advantages of this system:
 Representation is similar to the Indian numeral system, with a small number of digits for huge numbers
 There is no "place value". The number/word can be written with the digits/letters interchanged, with no change in value  can be altered for meter and rhyme
 Allows for up to values of 10^{18} with a single 'digit' (more than sufficient for 'circumference of the sky' which works out as 12.4 trillon yOjanas [12,474,720,576,000] or Lifespan of brahma which works out as 309 trillion years [309,173,760,000,000] which are probably among the largest numbers AryabhaTa dealt with)
 While it might be possible to write numbers in more than one way, each representation yields exactly one numerical value, leaving no doubt as to the intended value.
One has to contend, however, that AryabhaTa intended this system only as a representation for huge numbers. Computation is not possible (at least, it isn't apparent) with this system as it is with the place value system.
Endnote: Thanks to Varahamihira Gopu for pointing out a mistake in spelling AryabhaTa's name . It isn't bhaTTa, but bhaTa. Wiki explicitly notes:
While there is a tendency to misspell his name as "Aryabhatta" by analogy with other names having the "bhatta" suffix, his name is properly spelled Aryabhata: every astronomical text spells his name thus, including Brahmagupta's references to him "in more than a hundred places by name". Furthermore, in most instances "Aryabhatta" does not fit the metre either. References provided are K V Sharma, 2001 and Bhau Daji, 1865.
8 comments:
Brilliant. Your two line translation is excellent and concise.
Is there a reason why you call him AryabhaTTa with a double T instead of AryabhaTa?
Varahamihira Gopu
bhaTTa is a common surname (in my view) very similar to Sharma, stylized Butt in Kashmiri, Bhat in Kannada, and so on. While AryabhaTTa makes nomenclaturesense, AryabhaTa at the same time (to me) seems misplaced.
I prefer AryabhaTTa, for those reasons. If AryabhaTa is correct, and I see some validation (other than our Government History textbooks (:)), I will modify my spelling and pronunciation.
Yes bhaTTa भट्टः is a common surname, usually associated with Brahmins. But bhaTa भठः is a valid word too  it means soldier.
Some people say it refers to a mercenary soldier, hence it is demeaning, that AryabhaTa was a learned Brahmin, so bhaTTa भट्टःis the right usage.I disagree: AryabhaTas were used as an honored guard in the Srirangam temple in Tamilnadu; there is an entrance called the "AryaBhTaaL vaasal"(Tamil: ஆர்யபடாள் வாசல்), named after them.
KV Sarma and KC Shukla, in their English translation of AryabhaTeeyam and in their other papers, state that AryabhaTa आर्यभठः is the right spelling based on metric measures and references in other works. There are actually studies and research papers analyzing this spelling and its variations in various manuscripts in different libraries in India.
Just for information.
Varahamihira Gopu
Thanks  will look into the references you have provided. I confess I haven't dwelt much on the spelling, and took it to be a misspell of bhaTTa.
How to find the reverse of it?? example i am given a number 15081947..how to find the word associated with it?
There is no single method to denote such a number in words. Because in Bhuta sankhya, there are multiple words to denote each number
For example eka, surya, chandra, indu, all represent the number 1. So 111 can be called ekasuryachandra or induchandraeka etc. Similarly two can be represented by netra, locana, aksha which all mean eye. Three can be represented by agni, guna, tri. So 123 can be indulocanaguna or ekanetraagni
If you have not seen this, go through the Powerpoint series for how magnificently the Sanskrit language developed mechanisms to represent numbers.
http://www.powershow.com/view/2ab9b4MmQ5N/Oral_Tradition_of_Sanskrit_powerpoint_ppt_presentation
Satish Parmar,
Here's my take on this:
15081947 Can be written as
10000000 : 10 * 10^6 +
5000000 : 5 * 10^6 +
80000 : 8 * 10^4 +
1000 : 10 * 10^2 +
900 : 9 * 10^2 +
40 : 40 * 10^0 +
7 : 7 * 10^0
Transcibing from the tables
10000000 : 10 * 10^6 (ञ + ऋ = ञृ)
5000000 : 5 * 10^6 (ङ + ऋ = ङृ)
80000 : 8 * 10^4 (ज + उ = जु)
1000 : 10 * 10^2 (ञ + इ = ञि)
900 : 9 * 10^2 (झ + इ = झि)
40 : 40 * 10^0 (र + अ = र)
7 : 7 * 10^0 (छ + अ = छ)
In other words,
15081947 = ञृङृजुञिझिरछ
As Gopu says, you can, of course, write this in many forms. You can, for instance, change the order of letters, or the mAtra associated with each leetter, without changing the value of the number.
i.e:
15081947 = झिरछञृङृजुञि
15081947 = झिरङृजुञिछञृ
15081947 = ञृङृजुञिझीराछा
and numerous combinations thereof.
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