256472568 has 120 divisors (see below), whose sum is σ = 789844440. Its totient is φ = 77695200.

The previous prime is 256472539. The next prime is 256472581. The reversal of 256472568 is 865274652.

256472568 is a `hidden beast` number, since 2 + 564 + 7 + 25 + 68 = 666.

256472568 is digitally balanced in base 3, 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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 76773 + ... + 80043.

It is an arithmetic number, because the mean of its divisors is an integer number (6582037).

Almost surely, 2^256472568 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 256472568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (394922220).

256472568 is an abundant number, since it is smaller than the sum of its proper divisors (533371872).

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

256472568 is a wasteful number, since it uses less digits than its factorization.

256472568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3311 (or 3287 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The square root of 256472568 is about 16014.7609410818. The cubic root of 256472568 is about 635.3508863214.

The spelling of 256472568 in words is "two hundred fifty-six million, four hundred seventy-two thousand, five hundred sixty-eight".