81393984

Names of 81393984

• Cardinal: 81393984 can be written as Eighty-one million, three hundred ninety-three thousand, nine hundred eighty-four.

Scientific notation

• Scientific notation: 8.1393984 × 10⁷

Factors of 81393984

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 2255

Divisors of 81393984

• Number of divisors d(n): 140
• Complete list of divisors:
  1 2 3 4 6 7 8 9 12 14 16 18 21 24 27 28 32 36 42 48 54 56 63 64 72 81 84 96 108 112 126 144 162 168 189 192 216 224 252 288 324 336 378 432 448 504 567 576 648 672 756 864 1008 1134 1296 1344 1512 1728 2016 2243 2268 2592 3024 4032 4486 4536 5184 6048 6729 8972 9072 12096 13458 15701 17944 18144 20187 26916 31402 35888 36288 40374 47103 53832 60561 62804 71776 80748 94206 107664 121122 125608 141309 143552 161496 181683 188412 215328 242244 251216 282618 322992 363366 376824 423927 430656 484488 502432 565236 645984 726732 753648 847854 968976 1004864 1130472 1271781 1291968 1453464 1507296 1695708 1937952 2260944 2543562 2906928 3014592 3391416 3875904 4521888 5087124 5813856 6782832 9043776 10174248 11627712 13565664 20348496 27131328 40696992 81393984
• Sum of all divisors σ(n): 275868384
• Sum of proper divisors (its aliquot sum) s(n): 194474400
• 81393984 is an abundant number, because the sum of its proper divisors (194474400) is greater than itself. Its abundance is 113080416

Bases of 81393984

• Binary: 100110110011111100101000000₂
• Hexadecimal: 0x4D9F940
• Base-36: 1CGK00

Squares and roots of 81393984

• 81393984 squared (81393984²) is 6624980631392256
• 81393984 cubed (81393984³) is 539233567511851182587904
• The square root of 81393984 is 9021.8614487255
• The cube root of 81393984 is 433.3752469651

Scales and comparisons

• 81,393,984 seconds is equal to 2 years, 30 weeks, 4 days, 1 hour, 26 minutes, 24 seconds.
• To count from 1 to 81,393,984 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 81393984 cubic inches would be around 36.1 feet tall.

Recreational maths with 81393984

• 81393984 backwards is 48939318
• The number of decimal digits it has is: 8
• The sum of 81393984's digits is 45
• More coming soon!