28395728 has 20 divisors (see below), whose sum is σ = 57912960. Its totient is φ = 13450464.

The previous prime is 28395713. The next prime is 28395733. The reversal of 28395728 is 82759382.

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, 46400 + ... + 47007.

It is an arithmetic number, because the mean of its divisors is an integer number (2895648).

Almost surely, 2^28395728 is an apocalyptic number.

It is an amenable number.

28395728 is an abundant number, since it is smaller than the sum of its proper divisors (29517232).

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

28395728 is a wasteful number, since it uses less digits than its factorization.

28395728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93434 (or 93428 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The square root of 28395728 is about 5328.7642094579. The cubic root of 28395728 is about 305.0827617384.

The spelling of 28395728 in words is "twenty-eight million, three hundred ninety-five thousand, seven hundred twenty-eight".