7920
7,920 is an even composite number composed of four prime numbers multiplied together.
7920 is an even composite number. It is composed of four distinct prime numbers multiplied together. It has a total of sixty divisors.
Prime factorization of 7920:
2^{4} × 3^{2} × 5^{} × 11^{}
(2 × 2 × 2 × 2 × 3 × 3 × 5 × 11)See below for interesting mathematical facts about the number 7920 from the Numbermatics database.
Names of 7920
 Cardinal: 7920 can be written as Seven thousand, nine hundred twenty.
Scientific notation
 Scientific notation: 7.92 × 10^{3}
Factors of 7920
Divisors of 7920
Bases of 7920
 Binary: 1111011110000_{2}
 Hexadecimal: 0x1EF0
 Base36: 640
Squares and roots of 7920
 7920 squared (7920^{2}) is 62726400
 7920 cubed (7920^{3}) is 496793088000

The
square root of 7920 is 88.9943818451 
The
cube root of 7920 is 19.9331098683
Scales and comparisons
How big is 7920? 7,920 seconds is equal to 2 hours, 12 minutes.

To count from 1 to 7,920 would take you about two hours.
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 randomlychosen 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 7920 cubic inches would be around 1.7 feet tall.
Recreational maths with 7920
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