28839724 has 12 divisors (see below), whose sum is σ = 51833824. Its totient is φ = 14030064.

The previous prime is 28839721. The next prime is 28839737. The reversal of 28839724 is 42793882.

It is a happy number.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28839721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97284 + ... + 97579.

Almost surely, 2^28839724 is an apocalyptic number.

It is an amenable number.

28839724 is a deficient number, since it is larger than the sum of its proper divisors (22994100).

28839724 is a wasteful number, since it uses less digits than its factorization.

28839724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194904 (or 194902 counting only the distinct ones).

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

The square root of 28839724 is about 5370.2629358347. The cubic root of 28839724 is about 306.6646381928.

The spelling of 28839724 in words is "twenty-eight million, eight hundred thirty-nine thousand, seven hundred twenty-four".