664824 has 16 divisors (see below), whose sum is σ = 1662120. Its totient is φ = 221600.

The previous prime is 664799. The next prime is 664843. The reversal of 664824 is 428466.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 664791 and 664800.

It is a congruent number.

It is an unprimeable number.

664824 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13827 + ... + 13874.

2⁶⁶⁴⁸²⁴ is an apocalyptic number.

It is an amenable number.

664824 is an abundant number, since it is smaller than the sum of its proper divisors (997296).

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

664824 is a wasteful number, since it uses less digits than its factorization.

664824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27710 (or 27706 counting only the distinct ones).

The product of its digits is 9216, while the sum is 30.

The square root of 664824 is about 815.3674018502. The cubic root of 664824 is about 87.2774863251.

The spelling of 664824 in words is "six hundred sixty-four thousand, eight hundred twenty-four".