668775208 has 32 divisors (see below), whose sum is σ = 1276704000. Its totient is φ = 328340160.

The previous prime is 668775187. The next prime is 668775251. The reversal of 668775208 is 802577866.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 506373 + ... + 507691.

It is an arithmetic number, because the mean of its divisors is an integer number (39897000).

Almost surely, 2^668775208 is an apocalyptic number.

It is an amenable number.

668775208 is a deficient number, since it is larger than the sum of its proper divisors (607928792).

668775208 is a wasteful number, since it uses less digits than its factorization.

668775208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425 (or 2421 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 49.

The square root of 668775208 is about 25860.6884672470. The cubic root of 668775208 is about 874.5004857248.

The spelling of 668775208 in words is "six hundred sixty-eight million, seven hundred seventy-five thousand, two hundred eight".