28856564 has 18 divisors (see below), whose sum is σ = 55508082. Its totient is φ = 13116400.

The previous prime is 28856557. The next prime is 28856587. The reversal of 28856564 is 46565882.

It can be written as a sum of positive squares in only one way, i.e., 27646564 + 1210000 = 5258^2 + 1100^2 .

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29327 + ... + 30294.

Almost surely, 2^28856564 is an apocalyptic number.

It is an amenable number.

28856564 is a deficient number, since it is larger than the sum of its proper divisors (26651518).

28856564 is a wasteful number, since it uses less digits than its factorization.

28856564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59647 (or 59634 counting only the distinct ones).

The product of its digits is 460800, while the sum is 44.

The square root of 28856564 is about 5371.8306004564. The cubic root of 28856564 is about 306.7243154592.

It can be divided in two parts, 2885 and 6564, that added together give a palindrome (9449).

The spelling of 28856564 in words is "twenty-eight million, eight hundred fifty-six thousand, five hundred sixty-four".