256523274 has 80 divisors (see below), whose sum is σ = 671033088. Its totient is φ = 71718048.

The previous prime is 256523263. The next prime is 256523287. The reversal of 256523274 is 472325652.

256523274 is a `hidden beast` number, since 2 + 565 + 23 + 2 + 74 = 666.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 50892 + ... + 55704.

Almost surely, 2^256523274 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256523274, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (335516544).

256523274 is an abundant number, since it is smaller than the sum of its proper divisors (414509814).

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

256523274 is a wasteful number, since it uses less digits than its factorization.

256523274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4881 (or 4872 counting only the distinct ones).

The product of its digits is 100800, while the sum is 36.

The square root of 256523274 is about 16016.3439648379. The cubic root of 256523274 is about 635.3927543198.

The spelling of 256523274 in words is "two hundred fifty-six million, five hundred twenty-three thousand, two hundred seventy-four".