640
640 is an even composite number composed of two prime numbers multiplied together.
640 is an even composite number. It is composed of two distinct prime numbers multiplied together. It has a total of sixteen divisors.
Prime factorization of 640:
2^{7} × 5^{}
(2 × 2 × 2 × 2 × 2 × 2 × 2 × 5)See below for interesting mathematical facts about the number 640 from the Numbermatics database.
Names of 640
 Cardinal: 640 can be written as Six hundred forty.
Scientific notation
 Scientific notation: 6.4 × 10^{2}
Factors of 640
Divisors of 640
Bases of 640
 Binary: 1010000000_{2}
 Hexadecimal: 0x280
 Base36: HS
Squares and roots of 640
Scales and comparisons
How big is 640? 640 seconds is equal to 10 minutes, 40 seconds.

To count from 1 to 640 would take you about five minutes.
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 640 cubic inches would be around 0.7 feet tall.
Recreational maths with 640
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The information we have on file for 640 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!
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