81640124709

Names of 81640124709

• Cardinal: 81640124709 can be written as Eighty-one billion, six hundred forty million, one hundred twenty-four thousand, seven hundred nine.

Scientific notation

• Scientific notation: 8.1640124709 × 10¹⁰

Factors of 81640124709

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 81

Divisors of 81640124709

• Number of divisors d(n): 144
• Complete list of divisors:
  1 3 11 13 17 33 37 39 51 111 143 169 187 221 289 407 429 481 507 561 629 663 867 1221 1369 1443 1859 1887 2431 2873 3179 3757 4107 5291 5577 6253 6919 7293 8177 8619 9537 10693 11271 15059 15873 17797 18759 20757 23273 24531 31603 32079 41327 45177 48841 50653 53391 68783 69819 89947 94809 106301 117623 123981 139009 146523 151959 195767 206349 231361 256003 269841 302549 318903 352869 395641 417027 537251 557183 587301 658489 694083 768009 861101 907647 1169311 1186923 1529099 1611753 1671549 1807117 1975467 2544971 2583303 3328039 3507933 3933137 4352051 4587297 5143333 5421351 7243379 7634913 8560357 9472111 9984117 11194313 11799411 13056153 14638717 15429999 19878287 21730137 25681071 28416333 33582939 43264507 43916151 56576663 59634861 66863329 94163927 123137443 129793521 145526069 161025887 169729989 190303321 200589987 282491781 369412329 436578207 483077661 570909963 735496619 1600786759 2093336531 2206489857 2473943173 4802360277 6280009593 7421829519 27213374903 81640124709
• Sum of all divisors σ(n): 140389577280
• Sum of proper divisors (its aliquot sum) s(n): 58749452571
• 81640124709 is a deficient number, because the sum of its proper divisors (58749452571) is less than itself. Its deficiency is 22890672138

Bases of 81640124709

• Binary: 1001100000010001000010111000100100101₂
• Hexadecimal: 0x1302217125
• Base-36: 11I6F7DX

Squares and roots of 81640124709

• 81640124709 squared (81640124709²) is 6665109962501072334681
• 81640124709 cubed (81640124709³) is 544140408537785858949586625732829
• The square root of 81640124709 is 285727.3607987169
• The cube root of 81640124709 is 4338.1165900513

Scales and comparisons

• 81,640,124,709 seconds is equal to 2,595 years, 46 weeks, 6 days, 20 hours, 25 minutes, 9 seconds.
• To count from 1 to 81,640,124,709 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 81640124709 cubic inches would be around 361.5 feet tall.

Recreational maths with 81640124709

• 81640124709 backwards is 90742104618
• The number of decimal digits it has is: 11
• The sum of 81640124709's digits is 42
• More coming soon!