275 (two hundred [and] seventy-five) is the natural number following 274 and preceding 276.

• 275 is an odd composite number with 2 prime factors.^[1]
• 275 is equivalent to the number of partitions of 28 when no partition occurs only once. Partitions are the number of ways of writing a number as a sum of other positive integers.^[2]
• 275 is the sum of fifth powers of the first two primes (2^5 + 3^5 = 275).
• 275 is the maximum number of pieces made by cutting an annulus with 22 cuts.^[3]
• 275 is the smallest non semiprime that follows the equations n>1 and the greatest common denominator of n and b^n-b is 1 for some value of b.^[4]