255690 has 32 divisors (see below), whose sum is σ = 682560. Its totient is φ = 68112.

The previous prime is 255679. The next prime is 255709. The reversal of 255690 is 96552.

It is a super-2 number, since 2×255690² = 130754752200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204 + ... + 743.

It is an arithmetic number, because the mean of its divisors is an integer number (21330).

2²⁵⁵⁶⁹⁰ is an apocalyptic number.

255690 is an abundant number, since it is smaller than the sum of its proper divisors (426870).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

255690 is a wasteful number, since it uses less digits than its factorization.

255690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963 (or 957 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 255690 is about 505.6579871811. The cubic root of 255690 is about 63.4704018135.

The spelling of 255690 in words is "two hundred fifty-five thousand, six hundred ninety".