256741728 has 24 divisors (see below), whose sum is σ = 673947288. Its totient is φ = 85580544.

The previous prime is 256741711. The next prime is 256741733. The reversal of 256741728 is 827147652.

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 256741728.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1337101 + ... + 1337292.

It is an arithmetic number, because the mean of its divisors is an integer number (28081137).

Almost surely, 2^256741728 is an apocalyptic number.

It is an amenable number.

256741728 is an abundant number, since it is smaller than the sum of its proper divisors (417205560).

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

256741728 is a wasteful number, since it uses less digits than its factorization.

256741728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2674406 (or 2674398 counting only the distinct ones).

The product of its digits is 188160, while the sum is 42.

The square root of 256741728 is about 16023.1622347151. The cubic root of 256741728 is about 635.5730689603.

The spelling of 256741728 in words is "two hundred fifty-six million, seven hundred forty-one thousand, seven hundred twenty-eight".