256538668 has 6 divisors (see below), whose sum is σ = 448942676. Its totient is φ = 128269332.

The previous prime is 256538647. The next prime is 256538693. The reversal of 256538668 is 866835652.

256538668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32067330 + ... + 32067337.

Almost surely, 2^256538668 is an apocalyptic number.

It is an amenable number.

256538668 is a deficient number, since it is larger than the sum of its proper divisors (192404008).

256538668 is a wasteful number, since it uses less digits than its factorization.

256538668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64134671 (or 64134669 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 49.

The square root of 256538668 is about 16016.8245292255. The cubic root of 256538668 is about 635.4054640703.

The spelling of 256538668 in words is "two hundred fifty-six million, five hundred thirty-eight thousand, six hundred sixty-eight".