256649496 has 32 divisors (see below), whose sum is σ = 662323200. Its totient is φ = 82789920.

The previous prime is 256649489. The next prime is 256649521. The reversal of 256649496 is 694946652.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171736 + ... + 173223.

It is an arithmetic number, because the mean of its divisors is an integer number (20697600).

Almost surely, 2^256649496 is an apocalyptic number.

It is an amenable number.

256649496 is an abundant number, since it is smaller than the sum of its proper divisors (405673704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256649496 is a wasteful number, since it uses less digits than its factorization.

256649496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344999 (or 344995 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 51.

The square root of 256649496 is about 16020.2838926156. The cubic root of 256649496 is about 635.4969520045.

The spelling of 256649496 in words is "two hundred fifty-six million, six hundred forty-nine thousand, four hundred ninety-six".