664584 has 16 divisors (see below), whose sum is σ = 1661520. Its totient is φ = 221520.

The previous prime is 664583. The next prime is 664589. The reversal of 664584 is 485466.

It is a happy number.

It is a plaindrome in base 9.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664584.

It is not an unprimeable number, because it can be changed into a prime (664583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13822 + ... + 13869.

It is an arithmetic number, because the mean of its divisors is an integer number (103845).

2⁶⁶⁴⁵⁸⁴ is an apocalyptic number.

It is an amenable number.

664584 is an abundant number, since it is smaller than the sum of its proper divisors (996936).

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

664584 is a wasteful number, since it uses less digits than its factorization.

664584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27700 (or 27696 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 664584 is about 815.2202156473. The cubic root of 664584 is about 87.2669827343.

The spelling of 664584 in words is "six hundred sixty-four thousand, five hundred eighty-four".