668304309 has 32 divisors (see below), whose sum is σ = 950709760. Its totient is φ = 416404800.

The previous prime is 668304281. The next prime is 668304311. The reversal of 668304309 is 903403866.

It is not a de Polignac number, because 668304309 - 2⁵ = 668304277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668304379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2176734 + ... + 2177040.

It is an arithmetic number, because the mean of its divisors is an integer number (29709680).

Almost surely, 2^668304309 is an apocalyptic number.

It is an amenable number.

668304309 is a deficient number, since it is larger than the sum of its proper divisors (282405451).

668304309 is a wasteful number, since it uses less digits than its factorization.

668304309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721.

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 668304309 is about 25851.5823306814. The cubic root of 668304309 is about 874.2951860018.

The spelling of 668304309 in words is "six hundred sixty-eight million, three hundred four thousand, three hundred nine".