256804728 has 32 divisors (see below), whose sum is σ = 651058560. Its totient is φ = 84395360.

The previous prime is 256804727. The next prime is 256804759. The reversal of 256804728 is 827408652.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 256804728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256804727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73650 + ... + 77057.

It is an arithmetic number, because the mean of its divisors is an integer number (20345580).

Almost surely, 2^256804728 is an apocalyptic number.

It is an amenable number.

256804728 is an abundant number, since it is smaller than the sum of its proper divisors (394253832).

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

256804728 is a wasteful number, since it uses less digits than its factorization.

256804728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150787 (or 150783 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 42.

The square root of 256804728 is about 16025.1280182094. The cubic root of 256804728 is about 635.6250509384.

The spelling of 256804728 in words is "two hundred fifty-six million, eight hundred four thousand, seven hundred twenty-eight".