256683 has 16 divisors (see below), whose sum is σ = 414720. Its totient is φ = 137856.

The previous prime is 256661. The next prime is 256687. The reversal of 256683 is 386652.

It is not a de Polignac number, because 256683 - 2⁵ = 256651 is a prime.

256683 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 256683.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3 + ... + 716.

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

2²⁵⁶⁶⁸³ is an apocalyptic number.

256683 is a deficient number, since it is larger than the sum of its proper divisors (158037).

256683 is a wasteful number, since it uses less digits than its factorization.

256683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746.

The product of its digits is 8640, while the sum is 30.

The square root of 256683 is about 506.6389246791. The cubic root of 256683 is about 63.5524604197.

It can be divided in two parts, 256 and 683, that added together give a palindrome (939).

The spelling of 256683 in words is "two hundred fifty-six thousand, six hundred eighty-three".