28375564 has 24 divisors (see below), whose sum is σ = 57824928. Its totient is φ = 11930880.

The previous prime is 28375549. The next prime is 28375631. The reversal of 28375564 is 46557382.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8077 + ... + 11044.

It is an arithmetic number, because the mean of its divisors is an integer number (2409372).

Almost surely, 2^28375564 is an apocalyptic number.

It is an amenable number.

28375564 is an abundant number, since it is smaller than the sum of its proper divisors (29449364).

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

28375564 is a wasteful number, since it uses less digits than its factorization.

28375564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19185 (or 19183 counting only the distinct ones).

The product of its digits is 201600, while the sum is 40.

The square root of 28375564 is about 5326.8718775657. The cubic root of 28375564 is about 305.0105308556.

The spelling of 28375564 in words is "twenty-eight million, three hundred seventy-five thousand, five hundred sixty-four".