664342 has 12 divisors (see below), whose sum is σ = 1159380. Its totient is φ = 284676.

The previous prime is 664331. The next prime is 664357. The reversal of 664342 is 243466.

It is a plaindrome in base 9.

It is a congruent number.

It is an unprimeable number.

664342 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 5 ways as a sum of consecutive naturals, for example, 3292 + ... + 3487.

It is an arithmetic number, because the mean of its divisors is an integer number (96615).

2⁶⁶⁴³⁴² is an apocalyptic number.

664342 is a deficient number, since it is larger than the sum of its proper divisors (495038).

664342 is a wasteful number, since it uses less digits than its factorization.

664342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6795 (or 6788 counting only the distinct ones).

The product of its digits is 3456, while the sum is 25.

The square root of 664342 is about 815.0717759805. The cubic root of 664342 is about 87.2563890527.

The spelling of 664342 in words is "six hundred sixty-four thousand, three hundred forty-two".