28785256 has 8 divisors (see below), whose sum is σ = 53972370. Its totient is φ = 14392624.

The previous prime is 28785221. The next prime is 28785257. The reversal of 28785256 is 65258782.

It can be written as a sum of positive squares in only one way, i.e., 26728900 + 2056356 = 5170^2 + 1434^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (28785257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1799071 + ... + 1799086.

Almost surely, 2^28785256 is an apocalyptic number.

It is an amenable number.

28785256 is a deficient number, since it is larger than the sum of its proper divisors (25187114).

28785256 is a wasteful number, since it uses less digits than its factorization.

28785256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3598163 (or 3598159 counting only the distinct ones).

The product of its digits is 268800, while the sum is 43.

The square root of 28785256 is about 5365.1892790469. The cubic root of 28785256 is about 306.4714563144.

The spelling of 28785256 in words is "twenty-eight million, seven hundred eighty-five thousand, two hundred fifty-six".