256188656 has 10 divisors (see below), whose sum is σ = 496365552. Its totient is φ = 128094320.

The previous prime is 256188617. The next prime is 256188671. The reversal of 256188656 is 656881652.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 256188656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8005880 + ... + 8005911.

Almost surely, 2^256188656 is an apocalyptic number.

It is an amenable number.

256188656 is a deficient number, since it is larger than the sum of its proper divisors (240176896).

256188656 is a wasteful number, since it uses less digits than its factorization.

256188656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16011799 (or 16011793 counting only the distinct ones).

The product of its digits is 691200, while the sum is 47.

The square root of 256188656 is about 16005.8944142463. The cubic root of 256188656 is about 635.1163578700.

The spelling of 256188656 in words is "two hundred fifty-six million, one hundred eighty-eight thousand, six hundred fifty-six".