81825728985

Names of 81825728985

• Cardinal: 81825728985 can be written as Eighty-one billion, eight hundred twenty-five million, seven hundred twenty-eight thousand, nine hundred eighty-five.

Scientific notation

• Scientific notation: 8.1825728985 × 10¹⁰

Factors of 81825728985

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 11
• Sum of prime factors: 3599

Divisors of 81825728985

• Number of divisors d(n): 384
• Complete list of divisors:
  1 3 5 7 9 11 13 15 19 21 27 33 35 39 45 55 57 63 65 77 81 91 95 99 105 117 133 135 143 165 171 189 195 209 231 243 247 273 285 297 315 351 385 399 405 429 455 495 513 567 585 627 665 693 715 741 819 855 891 945 1001 1045 1053 1155 1197 1215 1235 1287 1365 1463 1485 1539 1701 1729 1755 1881 1995 2079 2145 2223 2457 2565 2673 2717 2835 3003 3135 3159 3465 3541 3591 3705 3861 4095 4389 4455 4617 5005 5187 5265 5643 5985 6237 6435 6669 7315 7371 7695 8151 8505 8645 9009 9405 10395 10623 10773 11115 11583 12285 13167 13365 13585 15015 15561 15795 16929 17705 17955 18711 19019 19305 20007 21945 22113 23085 24453 24787 25935 27027 28215 31185 31869 32319 33345 34749 36855 38951 39501 40755 45045 46033 46683 50787 53115 53865 57057 57915 60021 65835 67279 73359 74361 77805 81081 84645 93555 95095 95607 100035 110565 116853 118503 122265 123935 135135 138099 140049 159345 161595 171171 173745 194755 197505 201837 220077 223083 230165 233415 243243 253935 272657 285285 286821 300105 322231 336395 350559 355509 366795 371805 405405 414297 420147 470953 478035 506363 513513 584265 592515 605511 660231 669249 690495 700245 740069 817971 855855 860463 874627 966693 1009185 1051677 1100385 1115415 1216215 1242891 1363285 1412859 1434105 1519089 1540539 1611155 1752795 1777545 1816533 2007747 2071485 2100735 2220207 2354765 2453913 2531815 2567565 2623881 2900079 3027555 3155031 3301155 3346245 3544541 3700345 3728673 4089855 4238577 4302315 4373135 4557267 4621617 4833465 5180483 5258385 5449599 6023241 6122389 6214455 6660621 7064295 7361739 7595445 7702695 7871643 8700237 9082665 9465093 9620897 10038735 10633623 11101035 11186019 12269565 12715731 13119405 13671801 14500395 15541449 15775155 16348797 17722705 18367167 18643365 19981863 21192885 22085217 22786335 23108085 23614929 25902415 26100711 27247995 28862691 30116205 30611945 31900869 33303105 36808695 38147193 39358215 41015403 43501185 46624347 47325465 48104485 53168115 55101501 55930095 59945589 63578655 66255651 67346279 68359005 70844787 77707245 78302133 81743985 86588073 91835835 95702607 99909315 110426085 114441579 118074645 123046209 130503555 139873041 144313455 159504345 165304503 179836767 190735965 202038837 205077015 212534361 233121735 259764219 275507505 287107821 299727945 331278255 336731395 354223935 391510665 419619123 432940365 478513035 495913509 572207895 606116511 615231045 699365205 779292657 826522515 861323463 899183835 1010194185 1062671805 1258857369 1298821095 1435539105 1487740527 1818349533 2098095615 2337877971 2479567545 3030582555 3896463285 4306617315 5455048599 6294286845 7438702635 9091747665 11689389855 16365145797 27275242995 81825728985
• Sum of all divisors σ(n): 207936368640
• Sum of proper divisors (its aliquot sum) s(n): 126110639655
• 81825728985 is an abundant number, because the sum of its proper divisors (126110639655) is greater than itself. Its abundance is 44284910670

Bases of 81825728985

• Binary: 1001100001101001100011000100111011001₂
• Hexadecimal: 0x130D3189D9
• Base-36: 11L8XCK9

Squares and roots of 81825728985

• 81825728985 squared (81825728985²) is 6695449923926669130225
• 81825728985 cubed (81825728985³) is 547860070907862495263556522071625
• The square root of 81825728985 is 286051.9690283569
• The cube root of 81825728985 is 4341.4015906939

Scales and comparisons

• 81,825,728,985 seconds is equal to 2,601 years, 41 weeks, 6 days, 1 hour, 9 minutes, 45 seconds.
• To count from 1 to 81,825,728,985 would take you about five thousand, two hundred 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 81825728985 cubic inches would be around 361.8 feet tall.

Recreational maths with 81825728985

• 81825728985 backwards is 58982752818
• 81825728985 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81825728985's digits is 63
• More coming soon!