81325918320

Names of 81325918320

• Cardinal: 81325918320 can be written as Eighty-one billion, three hundred twenty-five million, nine hundred eighteen thousand, three hundred twenty.

Scientific notation

• Scientific notation: 8.132591832 × 10¹⁰

Factors of 81325918320

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 10930944

Divisors of 81325918320

• Number of divisors d(n): 80
• Complete list of divisors:
  1 2 3 4 5 6 8 10 12 15 16 20 24 30 31 40 48 60 62 80 93 120 124 155 186 240 248 310 372 465 496 620 744 930 1240 1488 1860 2480 3720 7440 10930903 21861806 32792709 43723612 54654515 65585418 87447224 109309030 131170836 163963545 174894448 218618060 262341672 327927090 338857993 437236120 524683344 655854180 677715986 874472240 1016573979 1311708360 1355431972 1694289965 2033147958 2623416720 2710863944 3388579930 4066295916 5082869895 5421727888 6777159860 8132591832 10165739790 13554319720 16265183664 20331479580 27108639440 40662959160 81325918320
• Sum of all divisors σ(n): 260242962432
• Sum of proper divisors (its aliquot sum) s(n): 178917044112
• 81325918320 is an abundant number, because the sum of its proper divisors (178917044112) is greater than itself. Its abundance is 97591125792

Bases of 81325918320

• Binary: 1001011101111011001110000100001110000₂
• Hexadecimal: 0x12EF670870
• Base-36: 11CZCO6O

Squares and roots of 81325918320

• 81325918320 squared (81325918320²) is 6613904990591311622400
• 81325918320 cubed (81325918320³) is 537881897041069377504969082368000
• The square root of 81325918320 is 285176.9947243291
• The cube root of 81325918320 is 4332.5440999469

Scales and comparisons

• 81,325,918,320 seconds is equal to 2,585 years, 47 weeks, 3 days, 4 hours, 52 minutes.
• To count from 1 to 81,325,918,320 would take you about five thousand, one hundred seventy-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 81325918320 cubic inches would be around 361 feet tall.

Recreational maths with 81325918320

• 81325918320 backwards is 02381952318
• The number of decimal digits it has is: 11
• The sum of 81325918320's digits is 42
• More coming soon!