81639427140

Names of 81639427140

• Cardinal: 81639427140 can be written as Eighty-one billion, six hundred thirty-nine million, four hundred twenty-seven thousand, one hundred forty.

Scientific notation

• Scientific notation: 8.163942714 × 10¹⁰

Factors of 81639427140

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 1522

Divisors of 81639427140

• Number of divisors d(n): 288
• Complete list of divisors:
  1 2 3 4 5 6 9 10 12 15 18 20 29 30 36 41 45 58 60 82 87 90 116 123 145 164 174 180 205 246 261 290 348 349 369 410 435 492 522 580 615 698 738 820 870 1044 1047 1093 1189 1230 1305 1396 1476 1740 1745 1845 2094 2186 2378 2460 2610 3141 3279 3490 3567 3690 4188 4372 4756 5220 5235 5465 5945 6282 6558 6980 7134 7380 9837 10121 10470 10701 10930 11890 12564 13116 14268 14309 15705 16395 17835 19674 20242 20940 21402 21860 23780 28618 30363 31410 31697 32790 35670 39348 40484 42804 42927 44813 49185 50605 53505 57236 60726 62820 63394 65580 71340 71545 85854 89626 91089 95091 98370 101210 107010 121452 126788 128781 134439 143090 151815 158485 171708 179252 182178 190182 196740 202420 214020 214635 224065 257562 268878 285273 286180 303630 316970 364356 380364 381457 403317 414961 429270 448130 455445 475455 515124 537756 570546 607260 633940 643905 672195 762914 806634 829922 858540 896260 910890 950910 1141092 1144371 1244883 1287810 1299577 1344390 1426365 1525828 1613268 1659844 1821780 1901820 1907285 2016585 2074805 2288742 2489766 2575620 2599154 2688780 2852730 3433113 3734649 3814570 3898731 4033170 4149610 4577484 4979532 5198308 5705460 5721855 6224415 6497885 6866226 7469298 7629140 7797462 8066340 8299220 11062253 11443710 11696193 12448830 12995770 13732452 14938596 15594924 15639737 17165565 18673245 19493655 22124506 22887420 23392386 24897660 25991540 31279474 33186759 34331130 37346490 38987310 44249012 46784772 46919211 55311265 58480965 62558948 66373518 68662260 74692980 77974620 78198685 93838422 99560277 110622530 116961930 132747036 140757633 156397370 165933795 187676844 199120554 221245060 233923860 234596055 281515266 312794740 331867590 398241108 453552373 469192110 497801385 563030532 663735180 703788165 907104746 938384220 995602770 1360657119 1407576330 1814209492 1991205540 2267761865 2721314238 2815152660 4081971357 4535523730 5442628476 6803285595 8163942714 9071047460 13606571190 16327885428 20409856785 27213142380 40819713570 81639427140
• Sum of all divisors σ(n): 263419884000
• Sum of proper divisors (its aliquot sum) s(n): 181780456860
• 81639427140 is an abundant number, because the sum of its proper divisors (181780456860) is greater than itself. Its abundance is 100141029720

Bases of 81639427140

• Binary: 1001100000010000101101100110001000100₂
• Hexadecimal: 0x130216CC44
• Base-36: 11I60950

Squares and roots of 81639427140

• 81639427140 squared (81639427140²) is 6664996063747368579600
• 81639427140 cubed (81639427140³) is 544126460534690092520979490344000
• The square root of 81639427140 is 285726.1401062213
• The cube root of 81639427140 is 4338.1042344263

Scales and comparisons

• 81,639,427,140 seconds is equal to 2,595 years, 45 weeks, 5 days, 18 hours, 39 minutes.
• To count from 1 to 81,639,427,140 would take you about five thousand, one hundred ninety-one 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 81639427140 cubic inches would be around 361.5 feet tall.

Recreational maths with 81639427140

• 81639427140 backwards is 04172493618
• 81639427140 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81639427140's digits is 45
• More coming soon!