28772736 has 32 divisors (see below), whose sum is σ = 76428600. Its totient is φ = 9590784.

The previous prime is 28772713. The next prime is 28772753. The reversal of 28772736 is 63727782.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37081 + ... + 37848.

Almost surely, 2^28772736 is an apocalyptic number.

It is an amenable number.

28772736 is an abundant number, since it is smaller than the sum of its proper divisors (47655864).

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

28772736 is an equidigital number, since it uses as much as digits as its factorization.

28772736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74946 (or 74934 counting only the distinct ones).

The product of its digits is 197568, while the sum is 42.

The square root of 28772736 is about 5364.0223713180. The cubic root of 28772736 is about 306.4270171397.

The spelling of 28772736 in words is "twenty-eight million, seven hundred seventy-two thousand, seven hundred thirty-six".