668385768 has 16 divisors (see below), whose sum is σ = 1670964480. Its totient is φ = 222795248.

The previous prime is 668385691. The next prime is 668385779. The reversal of 668385768 is 867583866.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13924680 + ... + 13924727.

It is an arithmetic number, because the mean of its divisors is an integer number (104435280).

Almost surely, 2^668385768 is an apocalyptic number.

It is an amenable number.

668385768 is an abundant number, since it is smaller than the sum of its proper divisors (1002578712).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668385768 is a wasteful number, since it uses less digits than its factorization.

668385768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27849416 (or 27849412 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 57.

The square root of 668385768 is about 25853.1577955189. The cubic root of 668385768 is about 874.3307069051.

The spelling of 668385768 in words is "six hundred sixty-eight million, three hundred eighty-five thousand, seven hundred sixty-eight".