28704028 has 12 divisors (see below), whose sum is σ = 51301152. Its totient is φ = 14046560.

The previous prime is 28704017. The next prime is 28704061. The reversal of 28704028 is 82040782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76153 + ... + 76528.

It is an arithmetic number, because the mean of its divisors is an integer number (4275096).

Almost surely, 2^28704028 is an apocalyptic number.

It is an amenable number.

28704028 is a deficient number, since it is larger than the sum of its proper divisors (22597124).

28704028 is a wasteful number, since it uses less digits than its factorization.

28704028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152732 (or 152730 counting only the distinct ones).

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

The square root of 28704028 is about 5357.6140211852. The cubic root of 28704028 is about 306.1829114184.

The spelling of 28704028 in words is "twenty-eight million, seven hundred four thousand, twenty-eight".