28028564 has 12 divisors (see below), whose sum is σ = 49209888. Its totient is φ = 13968600.

The previous prime is 28028549. The next prime is 28028593. The reversal of 28028564 is 46582082.

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, 10022 + ... + 12509.

It is an arithmetic number, because the mean of its divisors is an integer number (4100824).

Almost surely, 2^28028564 is an apocalyptic number.

It is an amenable number.

28028564 is a deficient number, since it is larger than the sum of its proper divisors (21181324).

28028564 is a wasteful number, since it uses less digits than its factorization.

28028564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22846 (or 22844 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 35.

The square root of 28028564 is about 5294.2009784291. The cubic root of 28028564 is about 303.7621205796.

The spelling of 28028564 in words is "twenty-eight million, twenty-eight thousand, five hundred sixty-four".