28328724 has 24 divisors (see below), whose sum is σ = 73445120. Its totient is φ = 9442872.

The previous prime is 28328693. The next prime is 28328731. The reversal of 28328724 is 42782382.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131044 + ... + 131259.

Almost surely, 2^28328724 is an apocalyptic number.

It is an amenable number.

28328724 is an abundant number, since it is smaller than the sum of its proper divisors (45116396).

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

28328724 is a wasteful number, since it uses less digits than its factorization.

28328724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262316 (or 262308 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 28328724 is about 5322.4734851383. The cubic root of 28328724 is about 304.8426098283.

The spelling of 28328724 in words is "twenty-eight million, three hundred twenty-eight thousand, seven hundred twenty-four".