81816777728

Names of 81816777728

• Cardinal: 81816777728 can be written as Eighty-one billion, eight hundred sixteen million, seven hundred seventy-seven thousand, seven hundred twenty-eight.

Scientific notation

• Scientific notation: 8.1816777728 × 10¹⁰

Factors of 81816777728

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 36789

Divisors of 81816777728

• Number of divisors d(n): 88
• Complete list of divisors:
  1 2 4 7 8 14 16 28 32 56 64 112 128 224 256 313 448 512 626 896 1024 1252 1792 2191 2504 3584 4382 5008 7168 8764 10016 17528 20032 35056 36467 40064 70112 72934 80128 140224 145868 160256 255269 280448 291736 320512 510538 560896 583472 1021076 1121792 1166944 2042152 2243584 2333888 4084304 4667776 8168608 9335552 11414171 16337216 18671104 22828342 32674432 37342208 45656684 65348864 79899197 91313368 130697728 159798394 182626736 261395456 319596788 365253472 639193576 730506944 1278387152 1461013888 2556774304 2922027776 5113548608 5844055552 10227097216 11688111104 20454194432 40908388864 81816777728
• Sum of all divisors σ(n): 187520789952
• Sum of proper divisors (its aliquot sum) s(n): 105704012224
• 81816777728 is an abundant number, because the sum of its proper divisors (105704012224) is greater than itself. Its abundance is 23887234496

Bases of 81816777728

• Binary: 1001100001100101010001111010000000000₂
• Hexadecimal: 0x130CA8F400
• Base-36: 11L3LHQ8

Squares and roots of 81816777728

• 81816777728 squared (81816777728²) is 6693985117792956841984
• 81816777728 cubed (81816777728³) is 547680292497006247864501746532352
• The square root of 81816777728 is 286036.3223928039
• The cube root of 81816777728 is 4341.2432769255

Scales and comparisons

• 81,816,777,728 seconds is equal to 2,601 years, 27 weeks, 10 hours, 42 minutes, 8 seconds.
• To count from 1 to 81,816,777,728 would take you about five thousand, two hundred 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 81816777728 cubic inches would be around 361.8 feet tall.

Recreational maths with 81816777728

• 81816777728 backwards is 82777761818
• The number of decimal digits it has is: 11
• The sum of 81816777728's digits is 62
• More coming soon!