668990720
668,990,720 is an even composite number composed of four prime numbers multiplied together.
668990720 is an even composite number. It is composed of four distinct prime numbers multiplied together. It has a total of seventy-two divisors.
Prime factorization of 668990720:
28 × 5 × 331 × 1579
(2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 5 × 331 × 1579)See below for interesting mathematical facts about the number 668990720 from the Numbermatics database.
Names of 668990720
- Cardinal: 668990720 can be written as Six hundred sixty-eight million, nine hundred ninety thousand, seven hundred twenty.
Scientific notation
- Scientific notation: 6.6899072 × 108
Factors of 668990720
Divisors of 668990720
- Number of divisors d(n): 72
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Complete list of divisors:
1 2 4 5 8 10 16 20 32 40 64 80 128 160 256 320 331 640 662 1280 1324 1579 1655 2648 3158 3310 5296 6316 6620 7895 10592 12632 13240 15790 21184 25264 26480 31580 42368 50528 52960 63160 84736 101056 105920 126320 202112 211840 252640 404224 423680 505280 522649 1010560 1045298 2021120 2090596 2613245 4181192 5226490 8362384 10452980 16724768 20905960 33449536 41811920 66899072 83623840 133798144 167247680 334495360 668990720
- Sum of all divisors σ(n): 1608300960
- Sum of proper divisors (its aliquot sum) s(n): 939310240
- 668990720 is an abundant number, because the sum of its proper divisors (939310240) is greater than itself. Its abundance is 270319520
Bases of 668990720
- Binary: 1001111101111111111101000000002
- Hexadecimal: 0x27DFFD00
- Base-36: B2ASJK
Squares and roots of 668990720
- 668990720 squared (6689907202) is 447548583446118400
- 668990720 cubed (6689907203) is 299405849074598829621248000
-
The
square root of 668990720 is 25864.8549193689 -
The
cube root of 668990720 is 874.5944112101
Scales and comparisons
How big is 668990720?- 668,990,720 seconds is equal to 21 years, 14 weeks, 22 hours, 45 minutes, 20 seconds.
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To count from 1 to 668,990,720 would take you about thirty-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 668990720 cubic inches would be around 72.9 feet tall.
Recreational maths with 668990720
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