28055728 has 20 divisors (see below), whose sum is σ = 54860080. Its totient is φ = 13898304.

The previous prime is 28055717. The next prime is 28055747. The reversal of 28055728 is 82755082.

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, 6300 + ... + 9787.

It is an arithmetic number, because the mean of its divisors is an integer number (2743004).

Almost surely, 2^28055728 is an apocalyptic number.

It is an amenable number.

28055728 is a deficient number, since it is larger than the sum of its proper divisors (26804352).

28055728 is a wasteful number, since it uses less digits than its factorization.

28055728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16204 (or 16198 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 37.

The square root of 28055728 is about 5296.7658056591. The cubic root of 28055728 is about 303.8602196719.

The spelling of 28055728 in words is "twenty-eight million, fifty-five thousand, seven hundred twenty-eight".