640438864
640,438,864 is an even composite number composed of five prime numbers multiplied together.
640438864 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of eighty divisors.
Prime factorization of 640438864:
24 × 13 × 23 × 59 × 2269
(2 × 2 × 2 × 2 × 13 × 23 × 59 × 2269)See below for interesting mathematical facts about the number 640438864 from the Numbermatics database.
Names of 640438864
- Cardinal: 640438864 can be written as Six hundred forty million, four hundred thirty-eight thousand, eight hundred sixty-four.
Scientific notation
- Scientific notation: 6.40438864 × 108
Factors of 640438864
Divisors of 640438864
- Number of divisors d(n): 80
-
Complete list of divisors:
1 2 4 8 13 16 23 26 46 52 59 92 104 118 184 208 236 299 368 472 598 767 944 1196 1357 1534 2269 2392 2714 3068 4538 4784 5428 6136 9076 10856 12272 17641 18152 21712 29497 35282 36304 52187 58994 70564 104374 117988 133871 141128 208748 235976 267742 282256 417496 471952 535484 678431 834992 1070968 1356862 1740323 2141936 2713724 3079033 3480646 5427448 6158066 6961292 10854896 12316132 13922584 24632264 27845168 40027429 49264528 80054858 160109716 320219432 640438864
- Sum of all divisors σ(n): 1418659200
- Sum of proper divisors (its aliquot sum) s(n): 778220336
- 640438864 is an abundant number, because the sum of its proper divisors (778220336) is greater than itself. Its abundance is 137781472
Bases of 640438864
- Binary: 1001100010110001010010010100002
- Hexadecimal: 0x262C5250
- Base-36: ALATSG
Squares and roots of 640438864
- 640438864 squared (6404388642) is 410161938521610496
- 640438864 cubed (6404388643) is 262683645962818065508716544
-
The
square root of 640438864 is 25306.8936062885 -
The
cube root of 640438864 is 861.9708109689
Scales and comparisons
How big is 640438864?- 640,438,864 seconds is equal to 20 years, 18 weeks, 6 days, 11 hours, 41 minutes, 4 seconds.
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To count from 1 to 640,438,864 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 640438864 cubic inches would be around 71.8 feet tall.
Recreational maths with 640438864
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