28565824 has 42 divisors (see below), whose sum is σ = 65947290. Its totient is φ = 12241152.

The previous prime is 28565809. The next prime is 28565827. The reversal of 28565824 is 42856582.

It can be written as a sum of positive squares in only one way, i.e., 19079424 + 9486400 = 4368^2 + 3080^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28565827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1419 + ... + 7690.

Almost surely, 2^28565824 is an apocalyptic number.

It is an amenable number.

28565824 is an abundant number, since it is smaller than the sum of its proper divisors (37381466).

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

28565824 is an equidigital number, since it uses as much as digits as its factorization.

28565824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9135 (or 9118 counting only the distinct ones).

The product of its digits is 153600, while the sum is 40.

The square root of 28565824 is about 5344.7005528841. The cubic root of 28565824 is about 305.6907180215.

The spelling of 28565824 in words is "twenty-eight million, five hundred sixty-five thousand, eight hundred twenty-four".