256463644 has 24 divisors (see below), whose sum is σ = 459690336. Its totient is φ = 125160000.

The previous prime is 256463591. The next prime is 256463659. The reversal of 256463644 is 446364652.

256463644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 256463597 and 256463606.

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, 24214 + ... + 33154.

It is an arithmetic number, because the mean of its divisors is an integer number (19153764).

Almost surely, 2^256463644 is an apocalyptic number.

It is an amenable number.

256463644 is a deficient number, since it is larger than the sum of its proper divisors (203226692).

256463644 is a wasteful number, since it uses less digits than its factorization.

256463644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9117 (or 9115 counting only the distinct ones).

The product of its digits is 414720, while the sum is 40.

The square root of 256463644 is about 16014.4823206996. The cubic root of 256463644 is about 635.3435171941.

The spelling of 256463644 in words is "two hundred fifty-six million, four hundred sixty-three thousand, six hundred forty-four".