28724304 has 80 divisors (see below), whose sum is σ = 86458752. Its totient is φ = 8047104.

The previous prime is 28724303. The next prime is 28724341. The reversal of 28724304 is 40342782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28724303) 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 15 ways as a sum of consecutive naturals, for example, 17002 + ... + 18614.

Almost surely, 2^28724304 is an apocalyptic number.

28724304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28724304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43229376).

28724304 is an abundant number, since it is smaller than the sum of its proper divisors (57734448).

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

28724304 is a wasteful number, since it uses less digits than its factorization.

28724304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1684 (or 1678 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 28724304 is about 5359.5059473799. The cubic root of 28724304 is about 306.2549884513.

The spelling of 28724304 in words is "twenty-eight million, seven hundred twenty-four thousand, three hundred four".