256686652 has 12 divisors (see below), whose sum is σ = 453649896. Its totient is φ = 127072400.

The previous prime is 256686643. The next prime is 256686653.

256686652 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256686653) 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, 317278 + ... + 318085.

It is an arithmetic number, because the mean of its divisors is an integer number (37804158).

Almost surely, 2^256686652 is an apocalyptic number.

It is an amenable number.

256686652 is a deficient number, since it is larger than the sum of its proper divisors (196963244).

256686652 is a wasteful number, since it uses less digits than its factorization.

256686652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635468 (or 635466 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 46.

The square root of 256686652 is about 16021.4435055022. The cubic root of 256686652 is about 635.5276181928.

The spelling of 256686652 in words is "two hundred fifty-six million, six hundred eighty-six thousand, six hundred fifty-two".