640728140
640,728,140 is an even composite number composed of six prime numbers multiplied together.
640728140 is an even composite number. It is composed of six distinct prime numbers multiplied together. It has a total of ninety-six divisors.
Prime factorization of 640728140:
22 × 5 × 13 × 61 × 71 × 569
(2 × 2 × 5 × 13 × 61 × 71 × 569)See below for interesting mathematical facts about the number 640728140 from the Numbermatics database.
Names of 640728140
- Cardinal: 640728140 can be written as Six hundred forty million, seven hundred twenty-eight thousand, one hundred forty.
Scientific notation
- Scientific notation: 6.4072814 × 108
Factors of 640728140
Divisors of 640728140
- Number of divisors d(n): 96
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Complete list of divisors:
1 2 4 5 10 13 20 26 52 61 65 71 122 130 142 244 260 284 305 355 569 610 710 793 923 1138 1220 1420 1586 1846 2276 2845 3172 3692 3965 4331 4615 5690 7397 7930 8662 9230 11380 14794 15860 17324 18460 21655 29588 34709 36985 40399 43310 56303 69418 73970 80798 86620 112606 138836 147940 161596 173545 201995 225212 281515 347090 403990 451217 525187 563030 694180 807980 902434 1050374 1126060 1804868 2100748 2256085 2464339 2625935 4512170 4928678 5251870 9024340 9857356 10503740 12321695 24643390 32036407 49286780 64072814 128145628 160182035 320364070 640728140
- Sum of all divisors σ(n): 1496154240
- Sum of proper divisors (its aliquot sum) s(n): 855426100
- 640728140 is an abundant number, because the sum of its proper divisors (855426100) is greater than itself. Its abundance is 214697960
Bases of 640728140
- Binary: 1001100011000010111100010011002
- Hexadecimal: 0x2630BC4C
- Base-36: ALH0ZW
Squares and roots of 640728140
- 640728140 squared (6407281402) is 410532549387859600
- 640728140 cubed (6407281403) is 263039756778741420089144000
-
The
square root of 640728140 is 25312.6083207559 -
The
cube root of 640728140 is 862.1005709141
Scales and comparisons
How big is 640728140?- 640,728,140 seconds is equal to 20 years, 19 weeks, 2 days, 20 hours, 2 minutes, 20 seconds.
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To count from 1 to 640,728,140 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 640728140 cubic inches would be around 71.8 feet tall.
Recreational maths with 640728140
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