81481390016

Names of 81481390016

• Cardinal: 81481390016 can be written as Eighty-one billion, four hundred eighty-one million, three hundred ninety thousand and sixteen.

Scientific notation

• Scientific notation: 8.1481390016 × 10¹⁰

Factors of 81481390016

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 11
• Sum of prime factors: 2773

Divisors of 81481390016

• Number of divisors d(n): 224
• Complete list of divisors:
  1 2 4 8 13 16 26 29 31 32 41 52 58 62 64 82 104 116 124 164 208 232 248 328 377 403 416 464 496 533 656 754 806 832 899 928 992 1066 1189 1271 1312 1508 1612 1798 1856 1984 2132 2378 2542 2624 2657 3016 3224 3596 4264 4756 5084 5314 6032 6448 7192 8528 9512 10168 10628 11687 12064 12896 14384 15457 16523 17056 19024 20336 21256 23374 24128 25792 28768 30914 33046 34112 34541 36859 38048 40672 42512 46748 57536 61828 66092 69082 73718 76096 77053 81344 82367 85024 93496 108937 123656 132184 138164 147436 154106 164734 170048 186992 217874 247312 264368 276328 294872 308212 329468 373984 435748 479167 494624 528736 552656 589744 616424 658936 747968 871496 958334 989248 1001689 1057472 1070771 1105312 1179488 1232848 1317872 1416181 1742992 1916668 2003378 2141542 2210624 2358976 2388643 2465696 2635744 2832362 3159173 3377047 3485984 3833336 4006756 4283084 4777286 4931392 5271488 5664724 6318346 6754094 6971968 7666672 8013512 8566168 9554572 11329448 12636692 13508188 15333344 16027024 17132336 19109144 22658896 25273384 27016376 30666688 31052359 32054048 34264672 38218288 41069249 43901611 45317792 50546768 54032752 62104718 64108096 68529344 76436576 82138498 87803222 90635584 97934363 101093536 108065504 124209436 152873152 164276996 175606444 195868726 202187072 216131008 248418872 328553992 351212888 391737452 496837744 657107984 702425776 783474904 993675488 1273146719 1314215968 1404851552 1566949808 1987350976 2546293438 2628431936 2809703104 3133899616 5092586876 6267799232 10185173752 20370347504 40740695008 81481390016
• Sum of all divisors σ(n): 190549255680
• Sum of proper divisors (its aliquot sum) s(n): 109067865664
• 81481390016 is an abundant number, because the sum of its proper divisors (109067865664) is greater than itself. Its abundance is 27586475648

Bases of 81481390016

• Binary: 1001011111000101010110101011111000000₂
• Hexadecimal: 0x12F8AB57C0
• Base-36: 11FJWYWW

Squares and roots of 81481390016

• 81481390016 squared (81481390016²) is 6639216918939504480256
• 81481390016 cubed (81481390016³) is 540972623172935621665518507524096
• The square root of 81481390016 is 285449.4526461735
• The cube root of 81481390016 is 4335.3032006661

Scales and comparisons

• 81,481,390,016 seconds is equal to 2,590 years, 44 weeks, 3 days, 15 hours, 26 minutes, 56 seconds.
• To count from 1 to 81,481,390,016 would take you about five thousand, one hundred eighty-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 81481390016 cubic inches would be around 361.3 feet tall.

Recreational maths with 81481390016

• 81481390016 backwards is 61009318418
• 81481390016 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81481390016's digits is 41
• More coming soon!