28545664 has 32 divisors (see below), whose sum is σ = 64994400. Its totient is φ = 12233472.

The previous prime is 28545661. The next prime is 28545677. The reversal of 28545664 is 46654582.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (28545661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15034 + ... + 16825.

It is an arithmetic number, because the mean of its divisors is an integer number (2031075).

Almost surely, 2^28545664 is an apocalyptic number.

It is an amenable number.

28545664 is an abundant number, since it is smaller than the sum of its proper divisors (36448736).

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

28545664 is an equidigital number, since it uses as much as digits as its factorization.

28545664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31880 (or 31868 counting only the distinct ones).

The product of its digits is 230400, while the sum is 40.

The square root of 28545664 is about 5342.8142397055. The cubic root of 28545664 is about 305.6187885345.

The spelling of 28545664 in words is "twenty-eight million, five hundred forty-five thousand, six hundred sixty-four".