640906240

Names of 640906240

• Cardinal: 640906240 can be written as Six hundred forty million, nine hundred six thousand, two hundred forty.

Scientific notation

• Scientific notation: 6.4090624 × 10⁸

Factors of 640906240

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 9649

Divisors of 640906240

• Number of divisors d(n): 88
• Complete list of divisors:
  1 2 4 5 8 10 13 16 20 26 32 40 52 64 65 80 104 128 130 160 208 256 260 320 416 512 520 640 832 1024 1040 1280 1664 2080 2560 3328 4160 5120 6656 8320 9629 13312 16640 19258 33280 38516 48145 66560 77032 96290 125177 154064 192580 250354 308128 385160 500708 616256 625885 770320 1001416 1232512 1251770 1540640 2002832 2465024 2503540 3081280 4005664 4930048 5007080 6162560 8011328 9860096 10014160 12325120 16022656 20028320 24650240 32045312 40056640 49300480 64090624 80113280 128181248 160226560 320453120 640906240
• Sum of all divisors σ(n): 1655859240
• Sum of proper divisors (its aliquot sum) s(n): 1014953000
• 640906240 is an abundant number, because the sum of its proper divisors (1014953000) is greater than itself. Its abundance is 374046760

Bases of 640906240

• Binary: 100110001100110111010000000000₂
• Hexadecimal: 0x26337400
• Base-36: ALKUF4

Squares and roots of 640906240

• 640906240 squared (640906240²) is 410760808470937600
• 640906240 cubed (640906240³) is 263259165296468766490624000
• The square root of 640906240 is 25316.1260859557
• The cube root of 640906240 is 862.1804414437

Scales and comparisons

• 640,906,240 seconds is equal to 20 years, 19 weeks, 4 days, 21 hours, 30 minutes, 40 seconds.
• To count from 1 to 640,906,240 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 640906240 cubic inches would be around 71.8 feet tall.

Recreational maths with 640906240

• 640906240 backwards is 042609046
• The number of decimal digits it has is: 9
• The sum of 640906240's digits is 31
• More coming soon!