28056564 has 24 divisors (see below), whose sum is σ = 72739520. Its totient is φ = 9352152.

The previous prime is 28056547. The next prime is 28056569. The reversal of 28056564 is 46565082.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28056569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129784 + ... + 129999.

Almost surely, 2^28056564 is an apocalyptic number.

It is an amenable number.

28056564 is an abundant number, since it is smaller than the sum of its proper divisors (44682956).

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

28056564 is a wasteful number, since it uses less digits than its factorization.

28056564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259796 (or 259788 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 28056564 is about 5296.8447211524. The cubic root of 28056564 is about 303.8632377676.

The spelling of 28056564 in words is "twenty-eight million, fifty-six thousand, five hundred sixty-four".