81731728188

Names of 81731728188

• Cardinal: 81731728188 can be written as Eighty-one billion, seven hundred thirty-one million, seven hundred twenty-eight thousand, one hundred eighty-eight.

Scientific notation

• Scientific notation: 8.1731728188 × 10¹⁰

Factors of 81731728188

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 5174

Divisors of 81731728188

• Number of divisors d(n): 144
• Complete list of divisors:
  1 2 3 4 6 9 11 12 18 22 27 33 36 44 54 66 99 108 121 132 198 242 297 363 396 484 594 726 1089 1188 1452 1949 2178 3209 3267 3898 4356 5847 6418 6534 7796 9627 11694 12836 13068 17541 19254 21439 23388 28881 35082 35299 38508 42878 52623 57762 64317 70164 70598 85756 86643 105246 105897 115524 128634 141196 173286 192951 210492 211794 235829 257268 317691 346572 385902 388289 423588 471658 578853 635382 707487 771804 776578 943316 953073 1157706 1164867 1270764 1414974 1553156 1906146 2122461 2315412 2329734 2829948 3494601 3812292 4244922 4659468 6254341 6367383 6989202 8489844 10483803 12508682 12734766 13978404 18763023 20967606 25017364 25469532 37526046 41935212 56289069 68797751 75052092 112578138 137595502 168867207 206393253 225156276 275191004 337734414 412786506 619179759 675468828 756775261 825573012 1238359518 1513550522 1857539277 2270325783 2476719036 3027101044 3715078554 4540651566 6810977349 7430157108 9081303132 13621954698 20432932047 27243909396 40865864094 81731728188
• Sum of all divisors σ(n): 233103780000
• Sum of proper divisors (its aliquot sum) s(n): 151372051812
• 81731728188 is an abundant number, because the sum of its proper divisors (151372051812) is greater than itself. Its abundance is 69640323624

Bases of 81731728188

• Binary: 1001100000111100101110011001100111100₂
• Hexadecimal: 0x130797333C
• Base-36: 11JOYL30

Squares and roots of 81731728188

• 81731728188 squared (81731728188²) is 6680075392597113763344
• 81731728188 cubed (81731728188³) is 545974106263094689498945565940672
• The square root of 81731728188 is 285887.6146110565
• The cube root of 81731728188 is 4339.7384969181

Scales and comparisons

• 81,731,728,188 seconds is equal to 2,598 years, 42 weeks, 3 days, 1 hour, 49 minutes, 48 seconds.
• To count from 1 to 81,731,728,188 would take you about five thousand, one hundred ninety-seven 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 81731728188 cubic inches would be around 361.6 feet tall.

Recreational maths with 81731728188

• 81731728188 backwards is 88182713718
• 81731728188 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81731728188's digits is 54
• More coming soon!