81996131940

Names of 81996131940

• Cardinal: 81996131940 can be written as Eighty-one billion, nine hundred ninety-six million, one hundred thirty-one thousand, nine hundred forty.

Scientific notation

• Scientific notation: 8.199613194 × 10¹⁰

Factors of 81996131940

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 9459

Divisors of 81996131940

• Number of divisors d(n): 96
• Complete list of divisors:
  1 2 3 4 5 6 10 12 15 20 30 60 197 394 591 788 823 985 1182 1646 1970 2364 2469 2955 3292 3940 4115 4938 5910 8230 8429 9876 11820 12345 16460 16858 24690 25287 33716 42145 49380 50574 84290 101148 126435 162131 168580 252870 324262 486393 505740 648524 810655 972786 1621310 1660513 1945572 2431965 3242620 3321026 4863930 4981539 6642052 6937067 8302565 9727860 9963078 13874134 16605130 19926156 20811201 24907695 27748268 33210260 34685335 41622402 49815390 69370670 83244804 99630780 104056005 138741340 208112010 416224020 1366602199 2733204398 4099806597 5466408796 6833010995 8199613194 13666021990 16399226388 20499032985 27332043980 40998065970 81996131940
• Sum of all divisors σ(n): 231062388480
• Sum of proper divisors (its aliquot sum) s(n): 149066256540
• 81996131940 is an abundant number, because the sum of its proper divisors (149066256540) is greater than itself. Its abundance is 67070124600

Bases of 81996131940

• Binary: 1001100010111010110011010111001100100₂
• Hexadecimal: 0x131759AE64
• Base-36: 11O2DOBO

Squares and roots of 81996131940

• 81996131940 squared (81996131940²) is 6723365653121888163600
• 81996131940 cubed (81996131940³) is 551289977174246614764469905384000
• The square root of 81996131940 is 286349.6672601525
• The cube root of 81996131940 is 4344.4131728445

Scales and comparisons

• 81,996,131,940 seconds is equal to 2,607 years, 11 weeks, 4 days, 7 hours, 19 minutes.
• To count from 1 to 81,996,131,940 would take you about five thousand, two hundred fourteen 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 81996131940 cubic inches would be around 362 feet tall.

Recreational maths with 81996131940

• 81996131940 backwards is 04913169918
• The number of decimal digits it has is: 11
• The sum of 81996131940's digits is 51
• More coming soon!