81389440
81,389,440 is an even composite number composed of four prime numbers multiplied together.
81389440 is an even composite number. It is composed of four distinct prime numbers multiplied together. It has a total of ninety-six divisors.
Prime factorization of 81389440:
27 × 5 × 112 × 1051
(2 × 2 × 2 × 2 × 2 × 2 × 2 × 5 × 11 × 11 × 1051)See below for interesting mathematical facts about the number 81389440 from the Numbermatics database.
Names of 81389440
- Cardinal: 81389440 can be written as Eighty-one million, three hundred eighty-nine thousand, four hundred forty.
Scientific notation
- Scientific notation: 8.138944 × 107
Factors of 81389440
Divisors of 81389440
- Number of divisors d(n): 96
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Complete list of divisors:
1 2 4 5 8 10 11 16 20 22 32 40 44 55 64 80 88 110 121 128 160 176 220 242 320 352 440 484 605 640 704 880 968 1051 1210 1408 1760 1936 2102 2420 3520 3872 4204 4840 5255 7040 7744 8408 9680 10510 11561 15488 16816 19360 21020 23122 33632 38720 42040 46244 57805 67264 77440 84080 92488 115610 127171 134528 168160 184976 231220 254342 336320 369952 462440 508684 635855 672640 739904 924880 1017368 1271710 1479808 1849760 2034736 2543420 3699520 4069472 5086840 7399040 8138944 10173680 16277888 20347360 40694720 81389440
- Sum of all divisors σ(n): 214071480
- Sum of proper divisors (its aliquot sum) s(n): 132682040
- 81389440 is an abundant number, because the sum of its proper divisors (132682040) is greater than itself. Its abundance is 51292600
Bases of 81389440
- Binary: 1001101100111100111100000002
- Hexadecimal: 0x4D9E780
- Base-36: 1CGGHS
Squares and roots of 81389440
- 81389440 squared (813894402) is 6624240943513600
- 81389440 cubed (813894403) is 539143260817643536384000
-
The
square root of 81389440 is 9021.6096124805 -
The
cube root of 81389440 is 433.3671821027
Scales and comparisons
How big is 81389440?- 81,389,440 seconds is equal to 2 years, 30 weeks, 4 days, 10 minutes, 40 seconds.
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To count from 1 to 81,389,440 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 81389440 cubic inches would be around 36.1 feet tall.
Recreational maths with 81389440
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