256647168 has 126 divisors (see below), whose sum is σ = 754158639. Its totient is φ = 84099072.

The previous prime is 256647077. The next prime is 256647203. The reversal of 256647168 is 861746652.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 128323584 + 128323584 = 11328^2 + 11328^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=11328.

Its product of digits (483840) is a multiple of the sum of its prime divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4349923 + ... + 4349981.

Almost surely, 2^256647168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256647168

256647168 is an abundant number, since it is smaller than the sum of its proper divisors (497511471).

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

256647168 is an frugal number, since it uses more digits than its factorization.

256647168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150 (or 64 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 256647168 is about 16020.2112345624. The cubic root of 256647168 is about 635.4950305235.

The spelling of 256647168 in words is "two hundred fifty-six million, six hundred forty-seven thousand, one hundred sixty-eight".