664004 has 12 divisors (see below), whose sum is σ = 1267728. Its totient is φ = 301800.

The previous prime is 663997. The next prime is 664009. The reversal of 664004 is 400466.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664004.

It is not an unprimeable number, because it can be changed into a prime (664009) by changing a digit.

664004 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7502 + ... + 7589.

It is an arithmetic number, because the mean of its divisors is an integer number (105644).

2⁶⁶⁴⁰⁰⁴ is an apocalyptic number.

It is an amenable number.

664004 is a deficient number, since it is larger than the sum of its proper divisors (603724).

664004 is a wasteful number, since it uses less digits than its factorization.

664004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15106 (or 15104 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 664004 is about 814.8644058983. The cubic root of 664004 is about 87.2415886123.

The spelling of 664004 in words is "six hundred sixty-four thousand, four".