129991621728

Names of 129991621728

• Cardinal: 129991621728 can be written as One hundred twenty-nine billion, nine hundred ninety-one million, six hundred twenty-one thousand, seven hundred twenty-eight.

Scientific notation

• Scientific notation: 1.29991621728 × 10¹¹

Factors of 129991621728

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 79651751

Divisors of 129991621728

• Number of divisors d(n): 48
• Complete list of divisors:
  1 2 3 4 6 8 12 16 17 24 32 34 48 51 68 96 102 136 204 272 408 544 816 1632 79651729 159303458 238955187 318606916 477910374 637213832 955820748 1274427664 1354079393 1911641496 2548855328 2708158786 3823282992 4062238179 5416317572 7646565984 8124476358 10832635144 16248952716 21665270288 32497905432 43330540576 64995810864 129991621728
• Sum of all divisors σ(n): 361300247280
• Sum of proper divisors (its aliquot sum) s(n): 231308625552
• 129991621728 is an abundant number, because the sum of its proper divisors (231308625552) is greater than itself. Its abundance is 101317003824

Bases of 129991621728

• Binary: 1111001000100000110101011110001100000₂
• Hexadecimal: 0x1E441ABC60
• Base-36: 1NPTNL9C

Squares and roots of 129991621728

• 129991621728 squared (129991621728²) is 16897821719475441705984
• 129991621728 cubed (129991621728³) is 2196575248985234148829987122020352
• The square root of 129991621728 is 360543.5087863877
• The cube root of 129991621728 is 5065.6881895185

Scales and comparisons

• 129,991,621,728 seconds is equal to 4,133 years, 17 weeks, 1 day, 15 hours, 48 minutes, 48 seconds.
• To count from 1 to 129,991,621,728 would take you about eight thousand, two hundred sixty-six 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 129991621728 cubic inches would be around 422.1 feet tall.

Recreational maths with 129991621728

• 129991621728 backwards is 827126199921
• The number of decimal digits it has is: 12
• The sum of 129991621728's digits is 57
• More coming soon!