256775 has 6 divisors (see below), whose sum is σ = 318432. Its totient is φ = 205400.

The previous prime is 256771. The next prime is 256799. The reversal of 256775 is 577652.

It is a happy number.

It is not a de Polignac number, because 256775 - 2² = 256771 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256775.

It is not an unprimeable number, because it can be changed into a prime (256771) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 5111 + ... + 5160.

It is an arithmetic number, because the mean of its divisors is an integer number (53072).

2²⁵⁶⁷⁷⁵ is an apocalyptic number.

256775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

256775 is a deficient number, since it is larger than the sum of its proper divisors (61657).

256775 is a wasteful number, since it uses less digits than its factorization.

256775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10281 (or 10276 counting only the distinct ones).

The product of its digits is 14700, while the sum is 32.

The square root of 256775 is about 506.7297109900. The cubic root of 256775 is about 63.5600523105.

The spelling of 256775 in words is "two hundred fifty-six thousand, seven hundred seventy-five".