256447564 has 12 divisors (see below), whose sum is σ = 450117304. Its totient is φ = 127842624.

The previous prime is 256447561. The next prime is 256447591. The reversal of 256447564 is 465744652.

It is a self number, because there is not a number n which added to its sum of digits gives 256447564.

It is not an unprimeable number, because it can be changed into a prime (256447561) 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, 93774 + ... + 96469.

Almost surely, 2^256447564 is an apocalyptic number.

It is an amenable number.

256447564 is a deficient number, since it is larger than the sum of its proper divisors (193669740).

256447564 is a wasteful number, since it uses less digits than its factorization.

256447564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190584 (or 190582 counting only the distinct ones).

The product of its digits is 806400, while the sum is 43.

The square root of 256447564 is about 16013.9802672540. The cubic root of 256447564 is about 635.3302384604.

The spelling of 256447564 in words is "two hundred fifty-six million, four hundred forty-seven thousand, five hundred sixty-four".