668393008 has 10 divisors (see below), whose sum is σ = 1295011484. Its totient is φ = 334196496.

The previous prime is 668393003. The next prime is 668393023. The reversal of 668393008 is 800393866.

It is not an unprimeable number, because it can be changed into a prime (668393003) 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 as a sum of consecutive naturals, namely, 20887266 + ... + 20887297.

Almost surely, 2^668393008 is an apocalyptic number.

It is an amenable number.

668393008 is a deficient number, since it is larger than the sum of its proper divisors (626618476).

668393008 is a wasteful number, since it uses less digits than its factorization.

668393008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41774571 (or 41774565 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 668393008 is about 25853.2978167196. The cubic root of 668393008 is about 874.3338638302. Note that the first 3 decimals are identical.

The spelling of 668393008 in words is "six hundred sixty-eight million, three hundred ninety-three thousand, eight".