28136788 has 12 divisors (see below), whose sum is σ = 49289632. Its totient is φ = 14054040.

The previous prime is 28136743. The next prime is 28136807. The reversal of 28136788 is 88763182.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1681 + ... + 7687.

Almost surely, 2^28136788 is an apocalyptic number.

It is an amenable number.

28136788 is a deficient number, since it is larger than the sum of its proper divisors (21152844).

28136788 is a wasteful number, since it uses less digits than its factorization.

28136788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7182 (or 7180 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 28136788 is about 5304.4121257685. The cubic root of 28136788 is about 304.1525809536.

The spelling of 28136788 in words is "twenty-eight million, one hundred thirty-six thousand, seven hundred eighty-eight".