28086564 has 24 divisors (see below), whose sum is σ = 71493408. Its totient is φ = 8511040.

The previous prime is 28086547. The next prime is 28086571. The reversal of 28086564 is 46568082.

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, 106257 + ... + 106520.

It is an arithmetic number, because the mean of its divisors is an integer number (2978892).

Almost surely, 2^28086564 is an apocalyptic number.

It is an amenable number.

28086564 is an abundant number, since it is smaller than the sum of its proper divisors (43406844).

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

28086564 is a wasteful number, since it uses less digits than its factorization.

28086564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212795 (or 212793 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 28086564 is about 5299.6758391434. The cubic root of 28086564 is about 303.9715029844.

The spelling of 28086564 in words is "twenty-eight million, eighty-six thousand, five hundred sixty-four".