81220134138

Names of 81220134138

• Cardinal: 81220134138 can be written as Eighty-one billion, two hundred twenty million, one hundred thirty-four thousand, one hundred thirty-eight.

Scientific notation

• Scientific notation: 8.1220134138 × 10¹⁰

Factors of 81220134138

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 721

Divisors of 81220134138

• Number of divisors d(n): 144
• Complete list of divisors:
  1 2 3 6 11 13 19 22 26 33 38 39 57 66 78 114 121 143 209 242 247 286 363 418 429 494 627 673 726 741 858 1254 1346 1482 1573 2019 2299 2717 3146 4038 4598 4719 5434 6897 7403 8151 8749 9438 12787 13794 14806 16302 17498 22209 25574 26247 29887 38361 44418 52494 59774 76722 81433 89661 96239 140657 162866 166231 179322 192478 244299 281314 288717 332462 421971 452929 488598 498693 577434 843942 905858 997386 1058629 1358787 1547227 1828541 2117258 2717574 3094454 3175887 3657082 4641681 4982219 5485623 5888077 6351774 8605651 9283362 9964438 10971246 11776154 14946657 17211302 17664231 20113951 25816953 29893314 35328462 40227902 51633906 54804409 60341853 64768847 94662161 109608818 111873463 120683706 129537694 164413227 189324322 194306541 223746926 283986483 328826454 335620389 388613082 567972966 671240778 712457317 1041283771 1230608093 1424914634 2082567542 2137371951 2461216186 3123851313 3691824279 4274743902 6247702626 7383648558 13536689023 27073378046 40610067069 81220134138
• Sum of all divisors σ(n): 202706108640
• Sum of proper divisors (its aliquot sum) s(n): 121485974502
• 81220134138 is an abundant number, because the sum of its proper divisors (121485974502) is greater than itself. Its abundance is 40265840364

Bases of 81220134138

• Binary: 1001011101001000110001110010011111010₂
• Hexadecimal: 0x12E918E4FA
• Base-36: 11B8DCL6

Squares and roots of 81220134138

• 81220134138 squared (81220134138²) is 6596710189394713003044
• 81220134138 cubed (81220134138³) is 535785686452149975135246482316072
• The square root of 81220134138 is 284991.4632721479
• The cube root of 81220134138 is 4330.6647749483

Scales and comparisons

• 81,220,134,138 seconds is equal to 2,582 years, 28 weeks, 3 days, 20 hours, 22 minutes, 18 seconds.
• To count from 1 to 81,220,134,138 would take you about five thousand, one hundred sixty-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 81220134138 cubic inches would be around 360.9 feet tall.

Recreational maths with 81220134138

• 81220134138 backwards is 83143102218
• 81220134138 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81220134138's digits is 33
• More coming soon!