664306 has 8 divisors (see below), whose sum is σ = 1002204. Its totient is φ = 330240.

The previous prime is 664289. The next prime is 664319. The reversal of 664306 is 603466.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 664225 + 81 = 815^2 + 9^2 .

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.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 475 + ... + 1246.

2⁶⁶⁴³⁰⁶ is an apocalyptic number.

664306 is a deficient number, since it is larger than the sum of its proper divisors (337898).

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 product of its (nonzero) digits is 2592, while the sum is 25.

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".