256658 has 8 divisors (see below), whose sum is σ = 387660. Its totient is φ = 127440.

The previous prime is 256651. The next prime is 256661. The reversal of 256658 is 856652.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 187489 + 69169 = 433^2 + 263^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a nialpdrome in base 8.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256658.

It is not an unprimeable number, because it can be changed into a prime (256651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8 + ... + 716.

2²⁵⁶⁶⁵⁸ is an apocalyptic number.

256658 is a deficient number, since it is larger than the sum of its proper divisors (131002).

256658 is a wasteful number, since it uses less digits than its factorization.

256658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892.

The product of its digits is 14400, while the sum is 32.

The square root of 256658 is about 506.6142516748. The cubic root of 256658 is about 63.5503970924.

The spelling of 256658 in words is "two hundred fifty-six thousand, six hundred fifty-eight".