640651978820

Names of 640651978820

• Cardinal: 640651978820 can be written as Six hundred forty billion, six hundred fifty-one million, nine hundred seventy-eight thousand, eight hundred twenty.

Scientific notation

• Scientific notation: 6.4065197882 × 10¹¹

Factors of 640651978820

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 192241

Divisors of 640651978820

• Number of divisors d(n): 144
• Complete list of divisors:
  1 2 4 5 7 10 14 20 28 35 41 49 70 82 83 98 140 164 166 196 205 245 287 332 410 415 490 574 581 820 830 980 1148 1162 1435 1660 2009 2324 2870 2905 3403 4018 4067 5740 5810 6806 8036 8134 10045 11620 13612 16268 17015 20090 20335 23821 34030 40180 40670 47642 68060 81340 95284 119105 166747 192103 238210 333494 384206 476420 666988 768412 833735 960515 1344721 1667470 1921030 2689442 3334940 3842060 5378884 6723605 7876223 9413047 13447210 15752446 15944549 18826094 26894420 31504892 31889098 37652188 39381115 47065235 55133561 63778196 78762230 79722745 94130470 110267122 111611843 157524460 159445490 188260940 220534244 223223686 275667805 318890980 385934927 446447372 551335610 558059215 653726509 771869854 781282901 1102671220 1116118430 1307453018 1543739708 1562565802 1929674635 2232236860 2614906036 3125131604 3268632545 3859349270 3906414505 4576085563 6537265090 7718698540 7812829010 9152171126 13074530180 15625658020 18304342252 22880427815 32032598941 45760855630 64065197882 91521711260 128130395764 160162994705 320325989410 640651978820
• Sum of all divisors σ(n): 1622516531328
• Sum of proper divisors (its aliquot sum) s(n): 981864552508
• 640651978820 is an abundant number, because the sum of its proper divisors (981864552508) is greater than itself. Its abundance is 341212573688

Bases of 640651978820

• Binary: 1001010100101001110101010110100001000100₂
• Hexadecimal: 0x9529D56844
• Base-36: 86B7NAKK

Squares and roots of 640651978820

• 640651978820 squared (640651978820²) is 410434957965981728592400
• 640651978820 cubed (640651978820³) is 262945967997809716666685233212968000
• The square root of 640651978820 is 800407.3830369131
• The cube root of 640651978820 is 8620.6641123733

Scales and comparisons

• 640,651,978,820 seconds is equal to 20,370 years, 39 weeks, 11 hours, 20 seconds.
• To count from 1 to 640,651,978,820 would take you about forty thousand, seven hundred forty-one 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 640651978820 cubic inches would be around 718.4 feet tall.

Recreational maths with 640651978820

• 640651978820 backwards is 028879156046
• The number of decimal digits it has is: 12
• The sum of 640651978820's digits is 56
• More coming soon!