It is a happy number.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a plaindrome in base 9.
It is an unprimeable number.
664306 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
2664306 is an apocalyptic number.
664306 is a wasteful number, since it uses less digits than its factorization.
664306 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1916.
The square root of 664306 is about 815.0496917366. The cubic root of 664306 is about 87.2548129134.
The spelling of 664306 in words is "six hundred sixty-four thousand, three hundred six".