81490490220

Names of 81490490220

• Cardinal: 81490490220 can be written as Eighty-one billion, four hundred ninety million, four hundred ninety thousand, two hundred twenty.

Scientific notation

• Scientific notation: 8.149049022 × 10¹⁰

Factors of 81490490220

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 2456

Divisors of 81490490220

• Number of divisors d(n): 72
• Complete list of divisors:
  1 2 3 4 5 6 10 12 15 20 30 60 293 586 879 1172 1465 1758 2153 2930 3516 4306 4395 5860 6459 8612 8790 10765 12918 17580 21530 25836 32295 43060 64590 129180 630829 1261658 1892487 2523316 3154145 3784974 4635409 6308290 7569948 9270818 9462435 12616580 13906227 18541636 18924870 23177045 27812454 37849740 46354090 55624908 69531135 92708180 139062270 278124540 1358174837 2716349674 4074524511 5432699348 6790874185 8149049022 13581748370 16298098044 20372622555 27163496740 40745245110 81490490220
• Sum of all divisors σ(n): 229058511696
• Sum of proper divisors (its aliquot sum) s(n): 147568021476
• 81490490220 is an abundant number, because the sum of its proper divisors (147568021476) is greater than itself. Its abundance is 66077531256

Bases of 81490490220

• Binary: 1001011111001001101100011001101101100₂
• Hexadecimal: 0x12F936336C
• Base-36: 11FPC0OC

Squares and roots of 81490490220

• 81490490220 squared (81490490220²) is 6640699996295915648400
• 81490490220 cubed (81490490220³) is 541153898102106350371885158648000
• The square root of 81490490220 is 285465.3923332915
• The cube root of 81490490220 is 4335.4645899719

Scales and comparisons

• 81,490,490,220 seconds is equal to 2,591 years, 7 weeks, 3 days, 23 hours, 17 minutes.
• To count from 1 to 81,490,490,220 would take you about five thousand, one hundred eighty-two 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 81490490220 cubic inches would be around 361.3 feet tall.

Recreational maths with 81490490220

• 81490490220 backwards is 02209409418
• The number of decimal digits it has is: 11
• The sum of 81490490220's digits is 39
• More coming soon!