668654608 has 40 divisors (see below), whose sum is σ = 1373617440. Its totient is φ = 314227200.

The previous prime is 668654599. The next prime is 668654627. The reversal of 668654608 is 806456866.

It is a happy number.

668654608 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 284703 + ... + 287041.

It is an arithmetic number, because the mean of its divisors is an integer number (34340436).

Almost surely, 2^668654608 is an apocalyptic number.

668654608 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

668654608 is an abundant number, since it is smaller than the sum of its proper divisors (704962832).

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

668654608 is a wasteful number, since it uses less digits than its factorization.

668654608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3415 (or 3409 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 49.

The square root of 668654608 is about 25858.3566376520. The cubic root of 668654608 is about 874.4479164422.

The spelling of 668654608 in words is "six hundred sixty-eight million, six hundred fifty-four thousand, six hundred eight".