81532791990

Names of 81532791990

• Cardinal: 81532791990 can be written as Eighty-one billion, five hundred thirty-two million, seven hundred ninety-one thousand, nine hundred ninety.

Scientific notation

• Scientific notation: 8.153279199 × 10¹⁰

Factors of 81532791990

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 155675

Divisors of 81532791990

• Number of divisors d(n): 96
• Complete list of divisors:
  1 2 3 5 6 9 10 13 15 18 26 30 39 45 65 78 90 117 130 195 234 390 449 585 898 1170 1347 2245 2694 4041 4490 5837 6735 8082 11674 13470 17511 20205 29185 35022 40410 52533 58370 87555 105066 155203 175110 262665 310406 465609 525330 776015 931218 1396827 1552030 2017639 2328045 2793654 4035278 4656090 6052917 6984135 10088195 12105834 13968270 18158751 20176390 30264585 36317502 60529170 69686147 90793755 139372294 181587510 209058441 348430735 418116882 627175323 696861470 905919911 1045292205 1254350646 1811839822 2090584410 2717759733 3135876615 4529599555 5435519466 6271753230 8153279199 9059199110 13588798665 16306558398 27177597330 40766395995 81532791990
• Sum of all divisors σ(n): 228801736800
• Sum of proper divisors (its aliquot sum) s(n): 147268944810
• 81532791990 is an abundant number, because the sum of its proper divisors (147268944810) is greater than itself. Its abundance is 65736152820

Bases of 81532791990

• Binary: 1001011111011101110111010110010110110₂
• Hexadecimal: 0x12FBBBACB6
• Base-36: 11GEIOXI

Squares and roots of 81532791990

• 81532791990 squared (81532791990²) is 6647596169684608160100
• 81532791990 cubed (81532791990³) is 541997075736415901022089917599000
• The square root of 81532791990 is 285539.4753619891
• The cube root of 81532791990 is 4336.2146410947

Scales and comparisons

• 81,532,791,990 seconds is equal to 2,592 years, 25 weeks, 3 days, 13 hours, 46 minutes, 30 seconds.
• To count from 1 to 81,532,791,990 would take you about five thousand, one hundred eighty-four 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 81532791990 cubic inches would be around 361.4 feet tall.

Recreational maths with 81532791990

• 81532791990 backwards is 09919723518
• The number of decimal digits it has is: 11
• The sum of 81532791990's digits is 54
• More coming soon!