640056990

Names of 640056990

• Cardinal: 640056990 can be written as Six hundred forty million, fifty-six thousand, nine hundred ninety.

Scientific notation

• Scientific notation: 6.4005699 × 10⁸

Factors of 640056990

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 275

Divisors of 640056990

• Number of divisors d(n): 96
• Complete list of divisors:
  1 2 3 5 6 10 15 19 30 38 57 83 95 114 163 166 190 249 285 326 415 489 498 570 815 830 978 1245 1577 1630 2445 2490 3097 3154 4731 4890 6194 6889 7885 9291 9462 13529 13778 15485 15770 18582 20667 23655 27058 30970 34445 40587 41334 46455 47310 67645 68890 81174 92910 103335 130891 135290 202935 206670 257051 261782 392673 405870 514102 654455 771153 785346 1122907 1285255 1308910 1542306 1963365 2245814 2570510 3368721 3855765 3926730 5614535 6737442 7711530 11229070 16843605 21335233 33687210 42670466 64005699 106676165 128011398 213352330 320028495 640056990
• Sum of all divisors σ(n): 1646743680
• Sum of proper divisors (its aliquot sum) s(n): 1006686690
• 640056990 is an abundant number, because the sum of its proper divisors (1006686690) is greater than itself. Its abundance is 366629700

Bases of 640056990

• Binary: 100110001001100111111010011110₂
• Hexadecimal: 0x26267E9E
• Base-36: AL2N4U

Squares and roots of 640056990

• 640056990 squared (640056990²) is 409672950447860100
• 640056990 cubed (640056990³) is 262214035548076487547099000
• The square root of 640056990 is 25299.3476200477
• The cube root of 640056990 is 861.7994546771

Scales and comparisons

• 640,056,990 seconds is equal to 20 years, 18 weeks, 2 days, 1 hour, 36 minutes, 30 seconds.
• To count from 1 to 640,056,990 would take you about thirty 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 640056990 cubic inches would be around 71.8 feet tall.

Recreational maths with 640056990

• 640056990 backwards is 099650046
• The number of decimal digits it has is: 9
• The sum of 640056990's digits is 39
• More coming soon!