28028704 has 24 divisors (see below), whose sum is σ = 60198768. Its totient is φ = 12740160.

The previous prime is 28028701. The next prime is 28028723. The reversal of 28028704 is 40782082.

It is not an unprimeable number, because it can be changed into a prime (28028701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39462 + ... + 40165.

It is an arithmetic number, because the mean of its divisors is an integer number (2508282).

Almost surely, 2^28028704 is an apocalyptic number.

It is an amenable number.

28028704 is an abundant number, since it is smaller than the sum of its proper divisors (32170064).

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

28028704 is a wasteful number, since it uses less digits than its factorization.

28028704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79648 (or 79640 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 28028704 is about 5294.2142004267. The cubic root of 28028704 is about 303.7626263331.

The spelling of 28028704 in words is "twenty-eight million, twenty-eight thousand, seven hundred four".