81329691840

Names of 81329691840

• Cardinal: 81329691840 can be written as Eighty-one billion, three hundred twenty-nine million, six hundred ninety-one thousand, eight hundred forty.

Scientific notation

• Scientific notation: 8.132969184 × 10¹⁰

Factors of 81329691840

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 4983464

Divisors of 81329691840

• Number of divisors d(n): 112
• Complete list of divisors:
  1 2 3 4 5 6 8 10 12 15 16 17 20 24 30 32 34 40 48 51 60 64 68 80 85 96 102 120 136 160 170 192 204 240 255 272 320 340 408 480 510 544 680 816 960 1020 1088 1360 1632 2040 2720 3264 4080 5440 8160 16320 4983437 9966874 14950311 19933748 24917185 29900622 39867496 49834370 59801244 74751555 79734992 84718429 99668740 119602488 149503110 159469984 169436858 199337480 239204976 254155287 299006220 318939968 338873716 398674960 423592145 478409952 508310574 598012440 677747432 797349920 847184290 956819904 1016621148 1196024880 1270776435 1355494864 1594699840 1694368580 2033242296 2392049760 2541552870 2710989728 3388737160 4066484592 4784099520 5083105740 5421979456 6777474320 8132969184 10166211480 13554948640 16265938368 20332422960 27109897280 40664845920 81329691840
• Sum of all divisors σ(n): 273411342432
• Sum of proper divisors (its aliquot sum) s(n): 192081650592
• 81329691840 is an abundant number, because the sum of its proper divisors (192081650592) is greater than itself. Its abundance is 110751958752

Bases of 81329691840

• Binary: 1001011101111101000001001110011000000₂
• Hexadecimal: 0x12EFA09CC0
• Base-36: 11D1LJUO

Squares and roots of 81329691840

• 81329691840 squared (81329691840²) is 6614518774789362585600
• 81329691840 cubed (81329691840³) is 537956773623513219996873621504000
• The square root of 81329691840 is 285183.6107492855
• The cube root of 81329691840 is 4332.6111088795

Scales and comparisons

• 81,329,691,840 seconds is equal to 2,586 years, 1 week, 4 days, 21 hours, 4 minutes.
• To count from 1 to 81,329,691,840 would take you about five thousand, one hundred seventy-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 81329691840 cubic inches would be around 361.1 feet tall.

Recreational maths with 81329691840

• 81329691840 backwards is 04819692318
• 81329691840 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81329691840's digits is 51
• More coming soon!