256517916 has 36 divisors (see below), whose sum is σ = 611610888. Its totient is φ = 83678048.

The previous prime is 256517903. The next prime is 256517939. The reversal of 256517916 is 619715652.

256517916 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21670 + ... + 31346.

Almost surely, 2^256517916 is an apocalyptic number.

It is an amenable number.

256517916 is an abundant number, since it is smaller than the sum of its proper divisors (355092972).

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

256517916 is a wasteful number, since it uses less digits than its factorization.

256517916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9778 (or 9729 counting only the distinct ones).

The product of its digits is 113400, while the sum is 42.

The square root of 256517916 is about 16016.1766973270. The cubic root of 256517916 is about 635.3883304742.

The spelling of 256517916 in words is "two hundred fifty-six million, five hundred seventeen thousand, nine hundred sixteen".