81189667728

Names of 81189667728

• Cardinal: 81189667728 can be written as Eighty-one billion, one hundred eighty-nine million, six hundred sixty-seven thousand, seven hundred twenty-eight.

Scientific notation

• Scientific notation: 8.1189667728 × 10¹⁰

Factors of 81189667728

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 4873

Divisors of 81189667728

• Number of divisors d(n): 240
• Complete list of divisors:
  1 2 3 4 6 8 9 12 13 16 18 24 26 36 37 39 48 52 72 74 78 104 111 117 144 148 156 208 222 234 257 296 312 333 444 468 481 514 592 624 666 771 888 936 962 1028 1332 1443 1542 1776 1872 1924 2056 2313 2664 2886 3084 3341 3848 4112 4329 4561 4626 5328 5772 6168 6682 7696 8658 9122 9252 9509 10023 11544 12336 13364 13683 17316 18244 18504 19018 20046 23088 26728 27366 28527 30069 34632 36488 37008 38036 40092 41049 53456 54732 57054 59293 60138 69264 72976 76072 80184 82098 85581 109464 114108 118586 120276 123617 152144 160368 164196 168757 171162 177879 218928 228216 237172 240552 247234 328392 337514 342324 355758 370851 456432 474344 481104 494468 506271 533637 656784 675028 684648 711516 741702 948688 988936 1012542 1067274 1112553 1172177 1350056 1369296 1423032 1483404 1518813 1977872 2025084 2134548 2193841 2225106 2344354 2700112 2846064 2966808 3037626 3516531 4050168 4269096 4387682 4450212 4688708 5933616 6075252 6581523 7033062 8100336 8538192 8775364 8900424 9377416 10549593 12150504 13163046 14066124 15238301 17550728 17800848 18754832 19744569 21099186 24301008 26326092 28132248 30476602 35101456 39489138 42198372 43370549 45714903 52652184 56264496 60953204 78978276 84396744 86741098 91429806 105304368 121906408 130111647 137144709 157956552 168793488 173482196 182859612 243812816 260223294 274289418 315913104 346964392 365719224 390334941 520446588 548578836 563817137 693928784 731438448 780669882 1040893176 1097157672 1127634274 1561339764 1691451411 2081786352 2194315344 2255268548 3122679528 3382902822 4510537096 5074354233 6245359056 6765805644 9021074192 10148708466 13531611288 20297416932 27063222576 40594833864 81189667728
• Sum of all divisors σ(n): 252343234416
• Sum of proper divisors (its aliquot sum) s(n): 171153566688
• 81189667728 is an abundant number, because the sum of its proper divisors (171153566688) is greater than itself. Its abundance is 89963898960

Bases of 81189667728

• Binary: 1001011100111010010000000001110010000₂
• Hexadecimal: 0x12E7480390
• Base-36: 11AQ8CK0

Squares and roots of 81189667728

• 81189667728 squared (81189667728²) is 6591762145783044681984
• 81189667728 cubed (81189667728³) is 535182978358133694106458387812352
• The square root of 81189667728 is 284938.0068155177
• The cube root of 81189667728 is 4330.1232166647

Scales and comparisons

• 81,189,667,728 seconds is equal to 2,581 years, 30 weeks, 1 day, 5 hours, 28 minutes, 48 seconds.
• To count from 1 to 81,189,667,728 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 81189667728 cubic inches would be around 360.8 feet tall.

Recreational maths with 81189667728

• 81189667728 backwards is 82776698118
• The number of decimal digits it has is: 11
• The sum of 81189667728's digits is 63
• More coming soon!