28756884 has 48 divisors (see below), whose sum is σ = 72607808. Its totient is φ = 8805888.

The previous prime is 28756873. The next prime is 28756909. The reversal of 28756884 is 48865782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52299 + ... + 52845.

Almost surely, 2^28756884 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28756884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36303904).

28756884 is an abundant number, since it is smaller than the sum of its proper divisors (43850924).

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

28756884 is a wasteful number, since it uses less digits than its factorization.

28756884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904 (or 902 counting only the distinct ones).

The product of its digits is 860160, while the sum is 48.

The square root of 28756884 is about 5362.5445452695. The cubic root of 28756884 is about 306.3707326834.

The spelling of 28756884 in words is "twenty-eight million, seven hundred fifty-six thousand, eight hundred eighty-four".