81918323130

Names of 81918323130

• Cardinal: 81918323130 can be written as Eighty-one billion, nine hundred eighteen million, three hundred twenty-three thousand, one hundred thirty.

Scientific notation

• Scientific notation: 8.191832313 × 10¹⁰

Factors of 81918323130

• Number of distinct prime factors ω(n): 8
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 5321

Divisors of 81918323130

• Number of divisors d(n): 256
• Complete list of divisors:
  1 2 3 5 6 7 10 14 15 17 21 30 34 35 42 51 61 70 73 85 102 105 119 122 146 170 183 210 219 238 255 305 357 365 366 427 438 510 511 595 610 714 730 854 915 1022 1037 1095 1190 1241 1281 1533 1785 1830 2074 2135 2190 2482 2555 2562 3066 3111 3570 3723 4270 4453 5110 5153 5185 6205 6222 6405 7259 7446 7665 8687 8906 10306 10370 12410 12810 13359 14518 15330 15459 15555 17374 18615 21777 22265 25765 26061 26718 30918 31110 31171 36071 36295 37230 43435 43554 44530 51530 52122 62342 66795 72142 72590 75701 77295 86870 87601 93513 108213 108885 130305 133590 151402 154590 155855 175202 180355 187026 216426 217770 227103 260610 262803 311710 314333 360710 376169 378505 438005 454206 467565 525606 529907 541065 613207 628666 752338 757010 876010 935130 942999 1059814 1082130 1128507 1135515 1226414 1314015 1571665 1589721 1839621 1880845 1885998 2200331 2257014 2271030 2628030 2633183 2649535 3066035 3143330 3179442 3679242 3761690 4400662 4714995 5266366 5299070 5343661 5642535 6132070 6394873 6600993 7899549 7948605 9198105 9429990 10687322 11001655 11285070 12789746 13165915 13201986 15799098 15897210 16030983 18396210 19184619 22003310 22946309 26331830 26718305 31974365 32061966 33004965 37405627 38369238 39497745 44764111 45892618 53436610 63948730 66009930 68838927 74811254 78995490 80154915 89528222 95923095 112216881 114731545 134292333 137677854 160309830 160624163 187028135 191846190 223820555 224433762 229463090 268584666 321248326 344194635 374056270 390087253 447641110 481872489 561084405 671461665 688389270 780174506 803120815 963744978 1122168810 1170261759 1342923330 1606241630 1950436265 2340523518 2409362445 2730610771 3900872530 4818724890 5461221542 5851308795 8191832313 11702617590 13653053855 16383664626 27306107710 40959161565 81918323130
• Sum of all divisors σ(n): 245167451136
• Sum of proper divisors (its aliquot sum) s(n): 163249128006
• 81918323130 is an abundant number, because the sum of its proper divisors (163249128006) is greater than itself. Its abundance is 81330804876

Bases of 81918323130

• Binary: 1001100010010101101100110100110111010₂
• Hexadecimal: 0x1312B669BA
• Base-36: 11MS1YNU

Squares and roots of 81918323130

• 81918323130 squared (81918323130²) is 6710611664431092996900
• 81918323130 cubed (81918323130³) is 549722054726813403739134288297000
• The square root of 81918323130 is 286213.7717336467
• The cube root of 81918323130 is 4343.0385527203

Scales and comparisons

• 81,918,323,130 seconds is equal to 2,604 years, 38 weeks, 6 days, 17 hours, 45 minutes, 30 seconds.
• To count from 1 to 81,918,323,130 would take you about five thousand, two hundred nine 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 81918323130 cubic inches would be around 361.9 feet tall.

Recreational maths with 81918323130

• 81918323130 backwards is 03132381918
• The number of decimal digits it has is: 11
• The sum of 81918323130's digits is 39
• More coming soon!