81391321088

Names of 81391321088

• Cardinal: 81391321088 can be written as Eighty-one billion, three hundred ninety-one million, three hundred twenty-one thousand and eighty-eight.

Scientific notation

• Scientific notation: 8.1391321088 × 10¹⁰

Factors of 81391321088

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 20
• Sum of prime factors: 147

Divisors of 81391321088

• Number of divisors d(n): 204
• Complete list of divisors:
  1 2 4 7 8 11 14 16 22 28 32 44 56 64 77 88 112 127 128 154 176 224 254 256 308 352 448 508 512 616 704 889 896 1016 1024 1232 1397 1408 1778 1792 2032 2048 2464 2794 2816 3556 3584 4064 4096 4928 5588 5632 7112 7168 8128 8192 9779 9856 11176 11264 14224 14336 16129 16256 16384 19558 19712 22352 22528 28448 28672 32258 32512 32768 39116 39424 44704 45056 56896 57344 64516 65024 65536 78232 78848 89408 90112 112903 113792 114688 129032 130048 156464 157696 177419 178816 180224 225806 227584 229376 258064 260096 312928 315392 354838 357632 360448 451612 455168 458752 516128 520192 625856 630784 709676 715264 720896 903224 910336 1032256 1040384 1241933 1251712 1261568 1419352 1430528 1806448 1820672 2064512 2080768 2483866 2503424 2523136 2838704 2861056 3612896 3641344 4129024 4161536 4967732 5006848 5046272 5677408 5722112 7225792 7282688 8258048 8323072 9935464 10013696 11354816 11444224 14451584 14565376 16516096 19870928 20027392 22709632 22888448 28903168 29130752 33032192 39741856 40054784 45419264 45776896 57806336 58261504 66064384 79483712 80109568 90838528 91553792 115612672 132128768 158967424 160219136 181677056 231225344 264257536 317934848 320438272 363354112 462450688 528515072 635869696 640876544 726708224 924901376 1057030144 1271739392 1453416448 1849802752 2543478784 2906832896 3699605504 5086957568 5813665792 7399211008 10173915136 11627331584 20347830272 40695660544 81391321088
• Sum of all divisors σ(n): 204558839712
• Sum of proper divisors (its aliquot sum) s(n): 123167518624
• 81391321088 is an abundant number, because the sum of its proper divisors (123167518624) is greater than itself. Its abundance is 41776197536

Bases of 81391321088

• Binary: 1001011110011010011010000000000000000₂
• Hexadecimal: 0x12F34D0000
• Base-36: 11E2AHA8

Squares and roots of 81391321088

• 81391321088 squared (81391321088²) is 6624547148449913503744
• 81391321088 cubed (81391321088³) is 539180644022081711469054994153472
• The square root of 81391321088 is 285291.6421628927
• The cube root of 81391321088 is 4333.7052076493

Scales and comparisons

• 81,391,321,088 seconds is equal to 2,587 years, 51 weeks, 4 days, 4 hours, 18 minutes, 8 seconds.
• To count from 1 to 81,391,321,088 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 81391321088 cubic inches would be around 361.1 feet tall.

Recreational maths with 81391321088

• 81391321088 backwards is 88012319318
• 81391321088 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81391321088's digits is 44
• More coming soon!