255778 has 16 divisors (see below), whose sum is σ = 414720. Its totient is φ = 117936.

The previous prime is 255767. The next prime is 255803. The reversal of 255778 is 877552.

It is a plaindrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1951 + ... + 2077.

It is an arithmetic number, because the mean of its divisors is an integer number (25920).

2²⁵⁵⁷⁷⁸ is an apocalyptic number.

255778 is a deficient number, since it is larger than the sum of its proper divisors (158942).

255778 is a wasteful number, since it uses less digits than its factorization.

255778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201.

The product of its digits is 19600, while the sum is 34.

The square root of 255778 is about 505.7449950321. The cubic root of 255778 is about 63.4776824460.

It can be divided in two parts, 2 and 55778, that multiplied together give a square (111556 = 334²).

The spelling of 255778 in words is "two hundred fifty-five thousand, seven hundred seventy-eight".