81490391136

Names of 81490391136

• Cardinal: 81490391136 can be written as Eighty-one billion, four hundred ninety million, three hundred ninety-one thousand, one hundred thirty-six.

Scientific notation

• Scientific notation: 8.1490391136 × 10¹⁰

Factors of 81490391136

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 3674734

Divisors of 81490391136

• Number of divisors d(n): 144
• Complete list of divisors:
  1 2 3 4 6 7 8 9 11 12 14 16 18 21 22 24 28 32 33 36 42 44 48 56 63 66 72 77 84 88 96 99 112 126 132 144 154 168 176 198 224 231 252 264 288 308 336 352 396 462 504 528 616 672 693 792 924 1008 1056 1232 1386 1584 1848 2016 2464 2772 3168 3696 5544 7392 11088 22176 3674711 7349422 11024133 14698844 22048266 25722977 29397688 33072399 40421821 44096532 51445954 58795376 66144798 77168931 80843642 88193064 102891908 117590752 121265463 132289596 154337862 161687284 176386128 205783816 231506793 242530926 264579192 282952747 308675724 323374568 352772256 363796389 411567632 463013586 485061852 529158384 565905494 617351448 646749136 727592778 823135264 848858241 926027172 970123704 1058316768 1131810988 1234702896 1293498272 1455185556 1697716482 1852054344 1940247408 2263621976 2469405792 2546574723 2910371112 3395432964 3704108688 3880494816 4527243952 5093149446 5820742224 6790865928 7408217376 9054487904 10186298892 11641484448 13581731856 20372597784 27163463712 40745195568 81490391136
• Sum of all divisors σ(n): 288920556288
• Sum of proper divisors (its aliquot sum) s(n): 207430165152
• 81490391136 is an abundant number, because the sum of its proper divisors (207430165152) is greater than itself. Its abundance is 125939774016

Bases of 81490391136

• Binary: 1001011111001001101001011000001100000₂
• Hexadecimal: 0x12F934B060
• Base-36: 11FP9W80

Squares and roots of 81490391136

• 81490391136 squared (81490391136²) is 6640683847498267370496
• 81490391136 cubed (81490391136³) is 541151924143151183104025266323456
• The square root of 81490391136 is 285465.2187850561
• The cube root of 81490391136 is 4335.4628328125

Scales and comparisons

• 81,490,391,136 seconds is equal to 2,591 years, 7 weeks, 2 days, 19 hours, 45 minutes, 36 seconds.
• To count from 1 to 81,490,391,136 would take you about five thousand, one hundred eighty-two 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 81490391136 cubic inches would be around 361.3 feet tall.

Recreational maths with 81490391136

• 81490391136 backwards is 63119309418
• The number of decimal digits it has is: 11
• The sum of 81490391136's digits is 45
• More coming soon!