81783267728

Names of 81783267728

• Cardinal: 81783267728 can be written as Eighty-one billion, seven hundred eighty-three million, two hundred sixty-seven thousand, seven hundred twenty-eight.

Scientific notation

• Scientific notation: 8.1783267728 × 10¹⁰

Factors of 81783267728

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 2751

Divisors of 81783267728

• Number of divisors d(n): 90
• Complete list of divisors:
  1 2 4 8 16 19 38 73 76 146 152 292 304 361 584 722 1168 1387 1444 2657 2774 2888 5314 5329 5548 5776 10628 10658 11096 21256 21316 22192 26353 42512 42632 50483 52706 85264 100966 101251 105412 193961 201932 202502 210824 387922 403864 405004 421648 775844 807728 810008 959177 1551688 1620016 1918354 1923769 3103376 3685259 3836708 3847538 7370518 7673416 7695076 14159153 14741036 15346832 15390152 28318306 29482072 30780304 56636612 58964144 70019921 113273224 140039842 226546448 269023907 280079684 538047814 560159368 1076095628 1120318736 2152191256 4304382512 5111454233 10222908466 20445816932 40891633864 81783267728
• Sum of all divisors σ(n): 169619826114
• Sum of proper divisors (its aliquot sum) s(n): 87836558386
• 81783267728 is an abundant number, because the sum of its proper divisors (87836558386) is greater than itself. Its abundance is 6053290658

Bases of 81783267728

• Binary: 1001100001010101010011010000110010000₂
• Hexadecimal: 0x130AA9A190
• Base-36: 11KJN98W

Squares and roots of 81783267728

• 81783267728 squared (81783267728²) is 6688502880269726281984
• 81783267728 cubed (81783267728³) is 547007621756598153372775495012352
• The square root of 81783267728 is 285977.7399169383
• The cube root of 81783267728 is 4340.6505096401

Scales and comparisons

• 81,783,267,728 seconds is equal to 2,600 years, 23 weeks, 4 days, 14 hours, 22 minutes, 8 seconds.
• To count from 1 to 81,783,267,728 would take you about five thousand, two hundred 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 81783267728 cubic inches would be around 361.7 feet tall.

Recreational maths with 81783267728

• 81783267728 backwards is 82776238718
• The number of decimal digits it has is: 11
• The sum of 81783267728's digits is 59
• More coming soon!