256187564 has 24 divisors (see below), whose sum is σ = 475339200. Its totient is φ = 120474000.

The previous prime is 256187563. The next prime is 256187641. The reversal of 256187564 is 465781652.

256187564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (256187563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1562 + ... + 22689.

It is an arithmetic number, because the mean of its divisors is an integer number (19805800).

Almost surely, 2^256187564 is an apocalyptic number.

It is an amenable number.

256187564 is a deficient number, since it is larger than the sum of its proper divisors (219151636).

256187564 is a wasteful number, since it uses less digits than its factorization.

256187564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24413 (or 24411 counting only the distinct ones).

The product of its digits is 403200, while the sum is 44.

The square root of 256187564 is about 16005.8603017770. The cubic root of 256187564 is about 635.1154554776.

The spelling of 256187564 in words is "two hundred fifty-six million, one hundred eighty-seven thousand, five hundred sixty-four".