28815256 has 16 divisors (see below), whose sum is σ = 54419400. Its totient is φ = 14303424.

The previous prime is 28815253. The next prime is 28815287. The reversal of 28815256 is 65251882.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28815253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11845 + ... + 14068.

Almost surely, 2^28815256 is an apocalyptic number.

It is an amenable number.

28815256 is a deficient number, since it is larger than the sum of its proper divisors (25604144).

28815256 is a wasteful number, since it uses less digits than its factorization.

28815256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26058 (or 26054 counting only the distinct ones).

The product of its digits is 38400, while the sum is 37.

The square root of 28815256 is about 5367.9843516911. The cubic root of 28815256 is about 306.5778875547.

The spelling of 28815256 in words is "twenty-eight million, eight hundred fifteen thousand, two hundred fifty-six".