668077688 has 16 divisors (see below), whose sum is σ = 1307108880. Its totient is φ = 319515328.

The previous prime is 668077651. The next prime is 668077691. The reversal of 668077688 is 886770866.

668077688 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent 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, 1815245 + ... + 1815612.

It is an arithmetic number, because the mean of its divisors is an integer number (81694305).

Almost surely, 2^668077688 is an apocalyptic number.

It is an amenable number.

668077688 is a deficient number, since it is larger than the sum of its proper divisors (639031192).

668077688 is a wasteful number, since it uses less digits than its factorization.

668077688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3630886 (or 3630882 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 56.

The square root of 668077688 is about 25847.1988424278. The cubic root of 668077688 is about 874.1963507624.

The spelling of 668077688 in words is "six hundred sixty-eight million, seventy-seven thousand, six hundred eighty-eight".