28339724 has 12 divisors (see below), whose sum is σ = 56679504. Its totient is φ = 12145584.

The previous prime is 28339723. The next prime is 28339739. The reversal of 28339724 is 42793382.

It is a happy number.

28339724 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (28339723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 506039 + ... + 506094.

It is an arithmetic number, because the mean of its divisors is an integer number (4723292).

Almost surely, 2^28339724 is an apocalyptic number.

It is an amenable number.

28339724 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28339724 is a wasteful number, since it uses less digits than its factorization.

28339724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012144 (or 1012142 counting only the distinct ones).

The product of its digits is 72576, while the sum is 38.

The square root of 28339724 is about 5323.5067389832. The cubic root of 28339724 is about 304.8820613614.

The spelling of 28339724 in words is "twenty-eight million, three hundred thirty-nine thousand, seven hundred twenty-four".