81165942

Names of 81165942

• Cardinal: 81165942 can be written as Eighty-one million, one hundred sixty-five thousand, nine hundred forty-two.

Scientific notation

• Scientific notation: 8.1165942 × 10⁷

Factors of 81165942

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 509

Divisors of 81165942

• Number of divisors d(n): 128
• Complete list of divisors:
  1 2 3 6 9 11 13 18 22 23 26 27 33 39 46 54 66 69 78 99 117 138 143 198 207 234 253 286 297 299 351 414 429 457 506 594 598 621 702 759 858 897 914 1242 1287 1371 1518 1794 2277 2574 2691 2742 3289 3861 4113 4554 5027 5382 5941 6578 6831 7722 8073 8226 9867 10054 10511 11882 12339 13662 15081 16146 17823 19734 21022 24678 29601 30162 31533 35646 45243 53469 59202 63066 65351 88803 90486 94599 106938 115621 130702 135729 136643 160407 177606 189198 196053 231242 271458 273286 283797 320814 346863 392106 409929 567594 588159 693726 819858 1040589 1176318 1229787 1503073 1764477 2081178 2459574 3006146 3121767 3528954 3689361 4509219 6243534 7378722 9018438 13527657 27055314 40582971 81165942
• Sum of all divisors σ(n): 221598720
• Sum of proper divisors (its aliquot sum) s(n): 140432778
• 81165942 is an abundant number, because the sum of its proper divisors (140432778) is greater than itself. Its abundance is 59266836

Bases of 81165942

• Binary: 100110101100111111001110110₂
• Hexadecimal: 0x4D67E76
• Base-36: 1CBO1I

Squares and roots of 81165942

• 81165942 squared (81165942²) is 6587910140747364
• 81165942 cubed (81165942³) is 534713932385112383076888
• The square root of 81165942 is 9009.2142831659
• The cube root of 81165942 is 432.9701384111

Scales and comparisons

• 81,165,942 seconds is equal to 2 years, 30 weeks, 1 day, 10 hours, 5 minutes, 42 seconds.
• To count from 1 to 81,165,942 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 81165942 cubic inches would be around 36.1 feet tall.

Recreational maths with 81165942

• 81165942 backwards is 24956118
• The number of decimal digits it has is: 8
• The sum of 81165942's digits is 36
• More coming soon!