81387900

Names of 81387900

• Cardinal: 81387900 can be written as Eighty-one million, three hundred eighty-seven thousand, nine hundred.

Scientific notation

• Scientific notation: 8.13879 × 10⁷

Factors of 81387900

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 8242

Divisors of 81387900

• Number of divisors d(n): 108
• Complete list of divisors:
  1 2 3 4 5 6 9 10 11 12 15 18 20 22 25 30 33 36 44 45 50 55 60 66 75 90 99 100 110 132 150 165 180 198 220 225 275 300 330 396 450 495 550 660 825 900 990 1100 1650 1980 2475 3300 4950 8221 9900 16442 24663 32884 41105 49326 73989 82210 90431 98652 123315 147978 164420 180862 205525 246630 271293 295956 361724 369945 411050 452155 493260 542586 616575 739890 813879 822100 904310 1085172 1233150 1356465 1479780 1627758 1808620 1849725 2260775 2466300 2712930 3255516 3699450 4069395 4521550 5425860 6782325 7398900 8138790 9043100 13564650 16277580 20346975 27129300 40693950 81387900
• Sum of all divisors σ(n): 278331144
• Sum of proper divisors (its aliquot sum) s(n): 196943244
• 81387900 is an abundant number, because the sum of its proper divisors (196943244) is greater than itself. Its abundance is 115555344

Bases of 81387900

• Binary: 100110110011110000101111100₂
• Hexadecimal: 0x4D9E17C
• Base-36: 1CGFB0

Squares and roots of 81387900

• 81387900 squared (81387900²) is 6623990266410000
• 81387900 cubed (81387900³) is 539112657403550439000000
• The square root of 81387900 is 9021.5242614537
• The cube root of 81387900 is 433.3644487847

Scales and comparisons

• 81,387,900 seconds is equal to 2 years, 30 weeks, 3 days, 23 hours, 45 minutes.
• To count from 1 to 81,387,900 would take you about 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 81387900 cubic inches would be around 36.1 feet tall.

Recreational maths with 81387900

• 81387900 backwards is 00978318
• 81387900 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 81387900's digits is 36
• More coming soon!