81643864140

Names of 81643864140

• Cardinal: 81643864140 can be written as Eighty-one billion, six hundred forty-three million, eight hundred sixty-four thousand, one hundred forty.

Scientific notation

• Scientific notation: 8.164386414 × 10¹⁰

Factors of 81643864140

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 579320

Divisors of 81643864140

• Number of divisors d(n): 144
• Complete list of divisors:
  1 2 3 4 5 6 9 10 12 15 18 20 27 29 30 36 45 54 58 60 81 87 90 108 116 135 145 162 174 180 243 261 270 290 324 348 405 435 486 522 540 580 783 810 870 972 1044 1215 1305 1566 1620 1740 2349 2430 2610 3132 3915 4698 4860 5220 7047 7830 9396 11745 14094 15660 23490 28188 35235 46980 70470 140940 579281 1158562 1737843 2317124 2896405 3475686 5213529 5792810 6951372 8689215 10427058 11585620 15640587 16799149 17378430 20854116 26067645 31281174 33598298 34756860 46921761 50397447 52135290 62562348 67196596 78202935 83995745 93843522 100794894 104270580 140765283 151192341 156405870 167991490 187687044 201589788 234608805 251987235 281530566 302384682 312811740 335982980 453577023 469217610 503974470 563061132 604769364 703826415 755961705 907154046 938435220 1007948940 1360731069 1407652830 1511923410 1814308092 2267885115 2721462138 2815305660 3023846820 4082193207 4535770230 5442924276 6803655345 8164386414 9071540460 13607310690 16328772828 20410966035 27214621380 40821932070 81643864140
• Sum of all divisors σ(n): 265681896480
• Sum of proper divisors (its aliquot sum) s(n): 184038032340
• 81643864140 is an abundant number, because the sum of its proper divisors (184038032340) is greater than itself. Its abundance is 102394168200

Bases of 81643864140

• Binary: 1001100000010010110101000000001001100₂
• Hexadecimal: 0x13025A804C
• Base-36: 11I8NCR0

Squares and roots of 81643864140

• 81643864140 squared (81643864140²) is 6665720551710777939600
• 81643864140 cubed (81643864140³) is 544215183119080598674411525944000
• The square root of 81643864140 is 285733.9044285785
• The cube root of 81643864140 is 4338.1828231691

Scales and comparisons

• 81,643,864,140 seconds is equal to 2,596 years, 1 week, 1 day, 3 hours, 9 minutes.
• To count from 1 to 81,643,864,140 would take you about five thousand, one hundred ninety-two 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 81643864140 cubic inches would be around 361.5 feet tall.

Recreational maths with 81643864140

• 81643864140 backwards is 04146834618
• 81643864140 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81643864140's digits is 45
• More coming soon!