28909824 has 36 divisors (see below), whose sum is σ = 76944336. Its totient is φ = 9636352.

The previous prime is 28909819. The next prime is 28909831. The reversal of 28909824 is 42890982.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

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, 18054 + ... + 19589.

Almost surely, 2^28909824 is an apocalyptic number.

28909824 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28909824 is an abundant number, since it is smaller than the sum of its proper divisors (48034512).

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

28909824 is an equidigital number, since it uses as much as digits as its factorization.

28909824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37662 (or 37648 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 28909824 is about 5376.7856568772. The cubic root of 28909824 is about 306.9129045199.

The spelling of 28909824 in words is "twenty-eight million, nine hundred nine thousand, eight hundred twenty-four".