256728068 has 24 divisors (see below), whose sum is σ = 465393600. Its totient is φ = 123770528.

The previous prime is 256728061. The next prime is 256728151. The reversal of 256728068 is 860827652.

It is not an unprimeable number, because it can be changed into a prime (256728061) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 157763 + ... + 159381.

It is an arithmetic number, because the mean of its divisors is an integer number (19391400).

Almost surely, 2^256728068 is an apocalyptic number.

It is an amenable number.

256728068 is a deficient number, since it is larger than the sum of its proper divisors (208665532).

256728068 is a wasteful number, since it uses less digits than its factorization.

256728068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3019 (or 3017 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 44.

The square root of 256728068 is about 16022.7359711130. The cubic root of 256728068 is about 635.5617968255.

The spelling of 256728068 in words is "two hundred fifty-six million, seven hundred twenty-eight thousand, sixty-eight".