256682 has 4 divisors (see below), whose sum is σ = 385026. Its totient is φ = 128340.

The previous prime is 256661. The next prime is 256687. The reversal of 256682 is 286652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 167281 + 89401 = 409^2 + 299^2 .

It is a nialpdrome in base 4.

It is a zygodrome in base 4.

It is not an unprimeable number, because it can be changed into a prime (256687) 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 as a sum of consecutive naturals, namely, 64169 + ... + 64172.

2²⁵⁶⁶⁸² is an apocalyptic number.

256682 is a deficient number, since it is larger than the sum of its proper divisors (128344).

256682 is a wasteful number, since it uses less digits than its factorization.

256682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128343.

The product of its digits is 5760, while the sum is 29.

The square root of 256682 is about 506.6379377820. The cubic root of 256682 is about 63.5523778891.

The spelling of 256682 in words is "two hundred fifty-six thousand, six hundred eighty-two".