28820564 has 12 divisors (see below), whose sum is σ = 52629024. Its totient is φ = 13783704.

The previous prime is 28820531. The next prime is 28820569. The reversal of 28820564 is 46502882.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28820569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156542 + ... + 156725.

It is an arithmetic number, because the mean of its divisors is an integer number (4385752).

Almost surely, 2^28820564 is an apocalyptic number.

It is an amenable number.

28820564 is a deficient number, since it is larger than the sum of its proper divisors (23808460).

28820564 is a wasteful number, since it uses less digits than its factorization.

28820564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313294 (or 313292 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 35.

The square root of 28820564 is about 5368.4787416921. The cubic root of 28820564 is about 306.5967110964.

The spelling of 28820564 in words is "twenty-eight million, eight hundred twenty thousand, five hundred sixty-four".