256728718 has 16 divisors (see below), whose sum is σ = 396049680. Its totient is φ = 124721856.

The previous prime is 256728709. The next prime is 256728721. The reversal of 256728718 is 817827652.

256728718 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 7 ways as a sum of consecutive naturals, for example, 63378 + ... + 67306.

It is an arithmetic number, because the mean of its divisors is an integer number (24753105).

Almost surely, 2^256728718 is an apocalyptic number.

256728718 is a deficient number, since it is larger than the sum of its proper divisors (139320962).

256728718 is a wasteful number, since it uses less digits than its factorization.

256728718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4851.

The product of its digits is 376320, while the sum is 46.

The square root of 256728718 is about 16022.7562547771. The cubic root of 256728718 is about 635.5623332099.

The spelling of 256728718 in words is "two hundred fifty-six million, seven hundred twenty-eight thousand, seven hundred eighteen".