81428155440

Names of 81428155440

• Cardinal: 81428155440 can be written as Eighty-one billion, four hundred twenty-eight million, one hundred fifty-five thousand, four hundred forty.

Scientific notation

• Scientific notation: 8.142815544 × 10¹⁰

Factors of 81428155440

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 6393

Divisors of 81428155440

• Number of divisors d(n): 160
• Complete list of divisors:
  1 2 3 4 5 6 8 10 12 15 16 20 24 30 40 48 60 80 97 120 194 240 291 388 485 582 617 776 970 1164 1234 1455 1552 1851 1940 2328 2468 2910 3085 3702 3880 4656 4936 5669 5820 6170 7404 7760 9255 9872 11338 11640 12340 14808 17007 18510 22676 23280 24680 28345 29616 34014 37020 45352 49360 56690 59849 68028 74040 85035 90704 113380 119698 136056 148080 170070 179547 226760 239396 272112 299245 340140 359094 453520 478792 549893 598490 680280 718188 897735 957584 1099786 1196980 1360560 1436376 1649679 1795470 2199572 2393960 2749465 2872752 3299358 3497773 3590940 4399144 4787920 5498930 6598716 6995546 7181880 8248395 8798288 10493319 10997860 13197432 13991092 14363760 16496790 17488865 20986638 21995720 26394864 27982184 32993580 34977730 41973276 43991440 52466595 55964368 65987160 69955460 83946552 104933190 131974320 139910920 167893104 209866380 279821840 339283981 419732760 678567962 839465520 1017851943 1357135924 1696419905 2035703886 2714271848 3392839810 4071407772 5089259715 5428543696 6785679620 8142815544 10178519430 13571359240 16285631088 20357038860 27142718480 40714077720 81428155440
• Sum of all divisors σ(n): 255488022720
• Sum of proper divisors (its aliquot sum) s(n): 174059867280
• 81428155440 is an abundant number, because the sum of its proper divisors (174059867280) is greater than itself. Its abundance is 92631711840

Bases of 81428155440

• Binary: 1001011110101011111110000110000110000₂
• Hexadecimal: 0x12F57F0C30
• Base-36: 11EO7YUO

Squares and roots of 81428155440

• 81428155440 squared (81428155440²) is 6630544498360801593600
• 81428155440 cubed (81428155440³) is 539913008064360177366660509184000
• The square root of 81428155440 is 285356.1904707867
• The cube root of 81428155440 is 4334.3588610795

Scales and comparisons

• 81,428,155,440 seconds is equal to 2,589 years, 8 weeks, 3 days, 12 hours, 4 minutes.
• To count from 1 to 81,428,155,440 would take you about five thousand, one hundred seventy-eight 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 81428155440 cubic inches would be around 361.2 feet tall.

Recreational maths with 81428155440

• 81428155440 backwards is 04455182418
• The number of decimal digits it has is: 11
• The sum of 81428155440's digits is 42
• More coming soon!