28664 has 8 divisors (see below), whose sum is σ = 53760. Its totient is φ = 14328.

The previous prime is 28663. The next prime is 28669. The reversal of 28664 is 46682.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28664.

It is not an unprimeable number, because it can be changed into a prime (28661) 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 as a sum of consecutive naturals, namely, 1784 + ... + 1799.

It is an arithmetic number, because the mean of its divisors is an integer number (6720).

2²⁸⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

28664 is a deficient number, since it is larger than the sum of its proper divisors (25096).

28664 is a wasteful number, since it uses less digits than its factorization.

28664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3589 (or 3585 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

The square root of 28664 is about 169.3044594805. The cubic root of 28664 is about 30.6040520358.

The spelling of 28664 in words is "twenty-eight thousand, six hundred sixty-four".