664344 has 24 divisors (see below), whose sum is σ = 1799460. Its totient is φ = 221424.

The previous prime is 664331. The next prime is 664357. The reversal of 664344 is 443466.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (664331) and next prime (664357).

It is a tau number, because it is divible by the number of its divisors (24).

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

It is a congruent number.

It is an unprimeable 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 5 ways as a sum of consecutive naturals, for example, 4542 + ... + 4685.

2⁶⁶⁴³⁴⁴ is an apocalyptic number.

It is an amenable number.

664344 is an abundant number, since it is smaller than the sum of its proper divisors (1135116).

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

664344 is a wasteful number, since it uses less digits than its factorization.

664344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9239 (or 9232 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

The square root of 664344 is about 815.0730028654. The cubic root of 664344 is about 87.2564766144.

It can be divided in two parts, 6643 and 44, that multiplied together give a palindrome (292292).

The spelling of 664344 in words is "six hundred sixty-four thousand, three hundred forty-four".