81376815440

Names of 81376815440

• Cardinal: 81376815440 can be written as Eighty-one billion, three hundred seventy-six million, eight hundred fifteen thousand, four hundred forty.

Scientific notation

• Scientific notation: 8.137681544 × 10¹⁰

Factors of 81376815440

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 141870

Divisors of 81376815440

• Number of divisors d(n): 80
• Complete list of divisors:
  1 2 4 5 8 10 16 20 40 43 80 86 167 172 215 334 344 430 668 688 835 860 1336 1670 1720 2672 3340 3440 6680 7181 13360 14362 28724 35905 57448 71810 114896 141653 143620 283306 287240 566612 574480 708265 1133224 1416530 2266448 2833060 5666120 6091079 11332240 12182158 23656051 24364316 30455395 47312102 48728632 60910790 94624204 97457264 118280255 121821580 189248408 236560510 243643160 378496816 473121020 487286320 946242040 1017210193 1892484080 2034420386 4068840772 5086050965 8137681544 10172101930 16275363088 20344203860 40688407720 81376815440
• Sum of all divisors σ(n): 194761784448
• Sum of proper divisors (its aliquot sum) s(n): 113384969008
• 81376815440 is an abundant number, because the sum of its proper divisors (113384969008) is greater than itself. Its abundance is 32008153568

Bases of 81376815440

• Binary: 1001011110010011011111010100101010000₂
• Hexadecimal: 0x12F26FA950
• Base-36: 11DTNKNK

Squares and roots of 81376815440

• 81376815440 squared (81376815440²) is 6622186091155822393600
• 81376815440 cubed (81376815440³) is 538892415349322375205406237184000
• The square root of 81376815440 is 285266.2185398053
• The cube root of 81376815440 is 4333.4477398329

Scales and comparisons

• 81,376,815,440 seconds is equal to 2,587 years, 27 weeks, 4 days, 6 hours, 57 minutes, 20 seconds.
• To count from 1 to 81,376,815,440 would take you about five thousand, one hundred seventy-five 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 81376815440 cubic inches would be around 361.1 feet tall.

Recreational maths with 81376815440

• 81376815440 backwards is 04451867318
• The number of decimal digits it has is: 11
• The sum of 81376815440's digits is 47
• More coming soon!