81197310090

Names of 81197310090

• Cardinal: 81197310090 can be written as Eighty-one billion, one hundred ninety-seven million, three hundred ten thousand and ninety.

Scientific notation

• Scientific notation: 8.119731009 × 10¹⁰

Factors of 81197310090

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 65308

Divisors of 81197310090

• Number of divisors d(n): 128
• Complete list of divisors:
  1 2 3 5 6 10 13 15 23 26 30 39 46 65 69 78 115 130 138 139 195 230 278 299 345 390 417 598 690 695 834 897 1390 1495 1794 1807 2085 2990 3197 3614 4170 4485 5421 6394 8970 9035 9591 10842 15985 18070 19182 27105 31970 41561 47955 54210 65123 83122 95910 124683 130246 195369 207805 249366 325615 390738 415610 623415 651230 846599 976845 1246830 1497829 1693198 1953690 2539797 2995658 4232995 4493487 5079594 7489145 8465990 8986974 9052097 12698985 14978290 18104194 19471777 22467435 25397970 27156291 38943554 44934870 45260485 54312582 58415331 90520970 97358885 116830662 117677261 135781455 194717770 208198231 235354522 271562910 292076655 353031783 416396462 584153310 588386305 624594693 706063566 1040991155 1176772610 1249189386 1765158915 2081982310 2706577003 3122973465 3530317830 5413154006 6245946930 8119731009 13532885015 16239462018 27065770030 40598655045 81197310090
• Sum of all divisors σ(n): 220567173120
• Sum of proper divisors (its aliquot sum) s(n): 139369863030
• 81197310090 is an abundant number, because the sum of its proper divisors (139369863030) is greater than itself. Its abundance is 58172552940

Bases of 81197310090

• Binary: 1001011100111101111001010000010001010₂
• Hexadecimal: 0x12E7BCA08A
• Base-36: 11AUS5FU

Squares and roots of 81197310090

• 81197310090 squared (81197310090²) is 6593003165851615808100
• 81197310090 cubed (81197310090³) is 535334122482005347697841633729000
• The square root of 81197310090 is 284951.4170696471
• The cube root of 81197310090 is 4330.2590768539

Scales and comparisons

• 81,197,310,090 seconds is equal to 2,581 years, 42 weeks, 5 days, 16 hours, 21 minutes, 30 seconds.
• To count from 1 to 81,197,310,090 would take you about five thousand, one hundred sixty-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 81197310090 cubic inches would be around 360.9 feet tall.

Recreational maths with 81197310090

• 81197310090 backwards is 09001379118
• 81197310090 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81197310090's digits is 39
• More coming soon!