81389477015

Names of 81389477015

• Cardinal: 81389477015 can be written as Eighty-one billion, three hundred eighty-nine million, four hundred seventy-seven thousand and fifteen.

Scientific notation

• Scientific notation: 8.1389477015 × 10¹⁰

Factors of 81389477015

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 96

Divisors of 81389477015

• Number of divisors d(n): 256
• Complete list of divisors:
  1 5 7 11 17 19 35 37 49 55 77 85 95 119 133 185 187 209 245 259 323 343 361 385 407 539 595 629 665 703 833 931 935 1045 1295 1309 1463 1615 1715 1805 1813 2035 2261 2527 2695 2849 3145 3515 3553 3773 3971 4165 4403 4655 4921 5831 6137 6517 6545 6859 6919 7315 7733 9065 9163 10241 11305 11951 12635 12691 13357 14245 15827 17689 17765 18865 19855 19943 22015 24605 24871 27797 29155 30685 30821 32585 34295 34447 34595 38665 42959 45815 48013 48433 51205 54131 59755 63455 64141 66785 67507 71687 75449 79135 83657 88445 93499 99715 110789 116603 123823 124355 131461 138985 139601 146927 154105 172235 174097 194579 214795 215747 227069 240065 241129 242165 253783 270655 300713 320705 336091 337535 339031 358435 377245 378917 418285 467495 472549 528143 553945 583015 585599 619115 654493 657305 698005 734635 816221 870485 920227 972895 1028489 1078735 1135345 1205645 1218679 1268915 1282633 1362053 1503565 1589483 1680455 1695155 1776481 1894585 2104991 2352637 2362745 2373217 2497759 2640715 2652419 2791613 2927995 3272465 3307843 3697001 4081105 4099193 4314311 4581451 4601135 5142445 5713547 6093395 6413165 6441589 6810265 7199423 7947415 8882405 8978431 10524955 11126381 11763185 11866085 12435367 12488795 13262095 13958065 16539215 17484313 18485005 19541291 20495965 21571555 22907255 23154901 25879007 28567735 30200177 32207945 35997115 39994829 44892155 45091123 47457421 50395961 55631905 62176835 62849017 77884667 87047569 87421565 97706455 115774505 122390191 129395035 136789037 151000885 199974145 211401239 225455615 237287105 251979805 314245085 332201947 389423335 435237845 439943119 611950955 683945185 856731337 957523259 1057006195 1479808673 1661009735 2199715595 2325413629 4283656685 4787616295 7399043365 11627068145 16277895403 81389477015
• Sum of all divisors σ(n): 142622208000
• Sum of proper divisors (its aliquot sum) s(n): 61232730985
• 81389477015 is a deficient number, because the sum of its proper divisors (61232730985) is less than itself. Its deficiency is 20156746030

Bases of 81389477015

• Binary: 1001011110011001100001101110010010111₂
• Hexadecimal: 0x12F330DC97
• Base-36: 11E16YDZ

Squares and roots of 81389477015

• 81389477015 squared (81389477015²) is 6624246968775213310225
• 81389477015 cubed (81389477015³) is 539143996406813646414279701978375
• The square root of 81389477015 is 285288.4102360277
• The cube root of 81389477015 is 4333.6724779963

Scales and comparisons

• 81,389,477,015 seconds is equal to 2,587 years, 48 weeks, 3 days, 20 hours, 3 minutes, 35 seconds.
• To count from 1 to 81,389,477,015 would take you about five thousand, one hundred seventy-five 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 81389477015 cubic inches would be around 361.1 feet tall.

Recreational maths with 81389477015

• 81389477015 backwards is 51077498318
• The number of decimal digits it has is: 11
• The sum of 81389477015's digits is 53
• More coming soon!