28357256 has 8 divisors (see below), whose sum is σ = 53169870. Its totient is φ = 14178624.

The previous prime is 28357243. The next prime is 28357267. The reversal of 28357256 is 65275382.

It can be written as a sum of positive squares in only one way, i.e., 16564900 + 11792356 = 4070^2 + 3434^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1772321 + ... + 1772336.

Almost surely, 2^28357256 is an apocalyptic number.

It is an amenable number.

28357256 is a deficient number, since it is larger than the sum of its proper divisors (24812614).

28357256 is a wasteful number, since it uses less digits than its factorization.

28357256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3544663 (or 3544659 counting only the distinct ones).

The product of its digits is 100800, while the sum is 38.

The square root of 28357256 is about 5325.1531433378. The cubic root of 28357256 is about 304.9449188359.

The spelling of 28357256 in words is "twenty-eight million, three hundred fifty-seven thousand, two hundred fifty-six".