28505588 has 12 divisors (see below), whose sum is σ = 49963620. Its totient is φ = 14230272.

The previous prime is 28505563. The next prime is 28505597. The reversal of 28505588 is 88550582.

It can be written as a sum of positive squares in 2 ways, for example, as 6340324 + 22165264 = 2518^2 + 4708^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2603 + ... + 7986.

It is an arithmetic number, because the mean of its divisors is an integer number (4163635).

Almost surely, 2^28505588 is an apocalyptic number.

It is an amenable number.

28505588 is a deficient number, since it is larger than the sum of its proper divisors (21458032).

28505588 is a wasteful number, since it uses less digits than its factorization.

28505588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11266 (or 11264 counting only the distinct ones).

The product of its (nonzero) digits is 128000, while the sum is 41.

The square root of 28505588 is about 5339.0624645157. The cubic root of 28505588 is about 305.4756994965.

The spelling of 28505588 in words is "twenty-eight million, five hundred five thousand, five hundred eighty-eight".