28766636 has 24 divisors (see below), whose sum is σ = 52450944. Its totient is φ = 13789440.

The previous prime is 28766623. The next prime is 28766671. The reversal of 28766636 is 63666782.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12986 + ... + 15038.

It is an arithmetic number, because the mean of its divisors is an integer number (2185456).

Almost surely, 2^28766636 is an apocalyptic number.

It is an amenable number.

28766636 is a deficient number, since it is larger than the sum of its proper divisors (23684308).

28766636 is a wasteful number, since it uses less digits than its factorization.

28766636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2201 (or 2199 counting only the distinct ones).

The product of its digits is 435456, while the sum is 44.

The square root of 28766636 is about 5363.4537380311. The cubic root of 28766636 is about 306.4053607944.

The spelling of 28766636 in words is "twenty-eight million, seven hundred sixty-six thousand, six hundred thirty-six".