255

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

• 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!