28775236 has 12 divisors (see below), whose sum is σ = 57550528. Its totient is φ = 12332232.

The previous prime is 28775209. The next prime is 28775239. The reversal of 28775236 is 63257782.

28775236 is an admirable number.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28775239) 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, 513816 + ... + 513871.

Almost surely, 2^28775236 is an apocalyptic number.

It is an amenable number.

28775236 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28775236 is a wasteful number, since it uses less digits than its factorization.

28775236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027698 (or 1027696 counting only the distinct ones).

The product of its digits is 141120, while the sum is 40.

The square root of 28775236 is about 5364.2554003328. The cubic root of 28775236 is about 306.4358918067.

The spelling of 28775236 in words is "twenty-eight million, seven hundred seventy-five thousand, two hundred thirty-six".