28398724 has 12 divisors (see below), whose sum is σ = 50089984. Its totient is φ = 14087304.

The previous prime is 28398707. The next prime is 28398761. The reversal of 28398724 is 42789382.

It is a happy 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, 27444 + ... + 28459.

Almost surely, 2^28398724 is an apocalyptic number.

It is an amenable number.

28398724 is a deficient number, since it is larger than the sum of its proper divisors (21691260).

28398724 is a wasteful number, since it uses less digits than its factorization.

28398724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56034 (or 56032 counting only the distinct ones).

The product of its digits is 193536, while the sum is 43.

The square root of 28398724 is about 5329.0453178782. The cubic root of 28398724 is about 305.0934910026.

The spelling of 28398724 in words is "twenty-eight million, three hundred ninety-eight thousand, seven hundred twenty-four".