256611728 has 40 divisors (see below), whose sum is σ = 512848128. Its totient is φ = 124319232.

The previous prime is 256611721. The next prime is 256611757. The reversal of 256611728 is 827116652.

256611728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 256611691 and 256611700.

It is not an unprimeable number, because it can be changed into a prime (256611721) 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, 75800 + ... + 79112.

Almost surely, 2^256611728 is an apocalyptic number.

It is an amenable number.

256611728 is a deficient number, since it is larger than the sum of its proper divisors (256236400).

256611728 is a wasteful number, since it uses less digits than its factorization.

256611728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3471 (or 3465 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The square root of 256611728 is about 16019.1050936062. The cubic root of 256611728 is about 635.4657776770.

The spelling of 256611728 in words is "two hundred fifty-six million, six hundred eleven thousand, seven hundred twenty-eight".