28398924 has 42 divisors (see below), whose sum is σ = 74520740. Its totient is φ = 9465336.

The previous prime is 28398919. The next prime is 28398947. The reversal of 28398924 is 42989382.

It is a self number, because there is not a number n which added to its sum of digits gives 28398924.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 1954 + ... + 7785.

Almost surely, 2^28398924 is an apocalyptic number.

It is an amenable number.

28398924 is an abundant number, since it is smaller than the sum of its proper divisors (46121816).

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

28398924 is an equidigital number, since it uses as much as digits as its factorization.

28398924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9761 (or 9744 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 28398924 is about 5329.0640829324. The cubic root of 28398924 is about 305.0942072150.

The spelling of 28398924 in words is "twenty-eight million, three hundred ninety-eight thousand, nine hundred twenty-four".