255

255 is an odd composite number composed of three prime numbers multiplied together.

What does the number 255 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 8 divisors.

255 is an odd composite number. It is composed of three distinct prime numbers multiplied together. It has a total of eight divisors.

Prime factorization of 255:

3 × 5 × 17

See below for interesting mathematical facts about the number 255 from the Numbermatics database.

Names of 255

Cardinal: 255 can be written as Two hundred fifty-five.

Scientific notation

Scientific notation: 2.55 × 10²

Factors of 255

Number of distinct prime factors ω(n): 3
Total number of prime factors Ω(n): 3
Sum of prime factors: 25

Divisors of 255

Number of divisors d(n): 8
Complete list of divisors:
1 3 5 15 17 51 85 255
Sum of all divisors σ(n): 432
Sum of proper divisors (its aliquot sum) s(n): 177
255 is a deficient number, because the sum of its proper divisors (177) is less than itself. Its deficiency is 78

Bases of 255

Binary: 11111111₂
Hexadecimal: 0xFF
Base-36: 73

Squares and roots of 255

255 squared (255²) is 65025
255 cubed (255³) is 16581375
The square root of 255 is 15.9687194227
The cube root of 255 is 6.3413257053

Scales and comparisons

How big is 255?

255 seconds is equal to 4 minutes, 15 seconds.
To count from 1 to 255 would take you about two 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 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 255 cubic inches would be around 0.5 feet tall.

Recreational maths with 255

255 backwards is 552
The number of decimal digits it has is: 3
The sum of 255's digits is 12
More coming soon!

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The information we have on file for 255 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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