81309440
81,309,440 is an even composite number composed of four prime numbers multiplied together.
81309440 is an even composite number. It is composed of four distinct prime numbers multiplied together. It has a total of seventy-two divisors.
Prime factorization of 81309440:
28 × 5 × 139 × 457
(2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 5 × 139 × 457)See below for interesting mathematical facts about the number 81309440 from the Numbermatics database.
Names of 81309440
- Cardinal: 81309440 can be written as Eighty-one million, three hundred nine thousand, four hundred forty.
Scientific notation
- Scientific notation: 8.130944 × 107
Factors of 81309440
Divisors of 81309440
- Number of divisors d(n): 72
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Complete list of divisors:
1 2 4 5 8 10 16 20 32 40 64 80 128 139 160 256 278 320 457 556 640 695 914 1112 1280 1390 1828 2224 2285 2780 3656 4448 4570 5560 7312 8896 9140 11120 14624 17792 18280 22240 29248 35584 36560 44480 58496 63523 73120 88960 116992 127046 146240 177920 254092 292480 317615 508184 584960 635230 1016368 1270460 2032736 2540920 4065472 5081840 8130944 10163680 16261888 20327360 40654720 81309440
- Sum of all divisors σ(n): 196591920
- Sum of proper divisors (its aliquot sum) s(n): 115282480
- 81309440 is an abundant number, because the sum of its proper divisors (115282480) is greater than itself. Its abundance is 33973040
Bases of 81309440
- Binary: 1001101100010101111000000002
- Hexadecimal: 0x4D8AF00
- Base-36: 1CEQRK
Squares and roots of 81309440
- 81309440 squared (813094402) is 6611225033113600
- 81309440 cubed (813094403) is 537555005156448272384000
-
The
square root of 81309440 is 9017.1747238257 -
The
cube root of 81309440 is 433.2251459045
Scales and comparisons
How big is 81309440?- 81,309,440 seconds is equal to 2 years, 30 weeks, 3 days, 1 hour, 57 minutes, 20 seconds.
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To count from 1 to 81,309,440 would take you about three years!
This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)
- A cube with a volume of 81309440 cubic inches would be around 36.1 feet tall.
Recreational maths with 81309440
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The information we have on file for 81309440 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!
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