640397394

Names of 640397394

• Cardinal: 640397394 can be written as Six hundred forty million, three hundred ninety-seven thousand, three hundred ninety-four.

Scientific notation

• Scientific notation: 6.40397394 × 10⁸

Factors of 640397394

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 44

Divisors of 640397394

• Number of divisors d(n): 160
• Complete list of divisors:
  1 2 3 6 7 9 13 14 18 19 21 26 27 38 39 42 54 57 63 78 91 114 117 126 133 171 182 189 234 247 266 273 342 351 361 378 399 494 513 546 702 722 741 798 819 1026 1083 1197 1482 1638 1729 2166 2223 2394 2457 2527 3249 3458 3591 4446 4693 4914 5054 5187 6498 6669 6859 7182 7581 9386 9747 10374 13338 13718 14079 15162 15561 19494 20577 22743 28158 31122 32851 41154 42237 45486 46683 48013 61731 65702 68229 84474 89167 93366 96026 98553 123462 126711 130321 136458 144039 178334 185193 197106 253422 260642 267501 288078 295659 370386 390963 432117 535002 591318 624169 781926 802503 864234 886977 912247 1172889 1248338 1296351 1605006 1694173 1773954 1824494 1872507 2345778 2407509 2592702 2736741 3388346 3518667 3745014 4815018 5082519 5473482 5617521 7037334 8210223 10165038 11235042 11859211 15247557 16420446 16852563 23718422 24630669 30495114 33705126 35577633 45742671 49261338 71155266 91485342 106732899 213465798 320198697 640397394
• Sum of all divisors σ(n): 1848819840
• Sum of proper divisors (its aliquot sum) s(n): 1208422446
• 640397394 is an abundant number, because the sum of its proper divisors (1208422446) is greater than itself. Its abundance is 568025052

Bases of 640397394

• Binary: 100110001010111011000001010010₂
• Hexadecimal: 0x262BB052
• Base-36: AL9XSI

Squares and roots of 640397394

• 640397394 squared (640397394²) is 410108822241991236
• 640397394 cubed (640397394³) is 262632621020180424905238984
• The square root of 640397394 is 25306.0742510569
• The cube root of 640397394 is 861.9522056535

Scales and comparisons

• 640,397,394 seconds is equal to 20 years, 18 weeks, 6 days, 9 minutes, 54 seconds.
• To count from 1 to 640,397,394 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 640397394 cubic inches would be around 71.8 feet tall.

Recreational maths with 640397394

• 640397394 backwards is 493793046
• The number of decimal digits it has is: 9
• The sum of 640397394's digits is 45
• More coming soon!