275

275 = 5 x 5 x 11.

275 is 101012 in base 3 and 10103 in base 4.

275 is the total number of parts in all partitions of 11. It is also the sum of the largest parts of all partitions of 11. And it is the number of partitions of 28 in which no part occurs only once.

275 is the sum of two distinct positive fifth powers: 275 = 3⁵ + 2⁵.

275 is the lesser of two consecutive numbers (275 and 276), each divisible by a square.

The Ferrari 275 was a 2-seat car produced between 1964 and 1968.

Source: What's Special About This Number?