28704564 has 96 divisors (see below), whose sum is σ = 87127040. Its totient is φ = 8001504.

The previous prime is 28704553. The next prime is 28704593. The reversal of 28704564 is 46540782.

28704564 is a `hidden beast` number, since 28 + 70 + 4 + 564 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32067 + ... + 32949.

Almost surely, 2^28704564 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28704564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43563520).

28704564 is an abundant number, since it is smaller than the sum of its proper divisors (58422476).

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

28704564 is a wasteful number, since it uses less digits than its factorization.

28704564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946 (or 938 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 28704564 is about 5357.6640432188. The cubic root of 28704564 is about 306.1848172255.

The spelling of 28704564 in words is "twenty-eight million, seven hundred four thousand, five hundred sixty-four".