28705256 has 32 divisors (see below), whose sum is σ = 55891200. Its totient is φ = 13806720.

The previous prime is 28705253. The next prime is 28705267. The reversal of 28705256 is 65250782.

It is not an unprimeable number, because it can be changed into a prime (28705253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69980 + ... + 70388.

It is an arithmetic number, because the mean of its divisors is an integer number (1746600).

Almost surely, 2^28705256 is an apocalyptic number.

It is an amenable number.

28705256 is a deficient number, since it is larger than the sum of its proper divisors (27185944).

28705256 is a wasteful number, since it uses less digits than its factorization.

28705256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729 (or 725 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 28705256 is about 5357.7286232134. The cubic root of 28705256 is about 306.1872776727.

The spelling of 28705256 in words is "twenty-eight million, seven hundred five thousand, two hundred fifty-six".