255784 has 8 divisors (see below), whose sum is σ = 479610. Its totient is φ = 127888.

The previous prime is 255767. The next prime is 255803. The reversal of 255784 is 487552.

It can be written as a sum of positive squares in only one way, i.e., 152100 + 103684 = 390^2 + 322^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15979 + ... + 15994.

2²⁵⁵⁷⁸⁴ is an apocalyptic number.

It is an amenable number.

255784 is a deficient number, since it is larger than the sum of its proper divisors (223826).

255784 is a wasteful number, since it uses less digits than its factorization.

255784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31979 (or 31975 counting only the distinct ones).

The product of its digits is 11200, while the sum is 31.

The square root of 255784 is about 505.7509268405. The cubic root of 255784 is about 63.4781787919.

The spelling of 255784 in words is "two hundred fifty-five thousand, seven hundred eighty-four".