668524870 has 64 divisors (see below), whose sum is σ = 1349187840. Its totient is φ = 236896128.

The previous prime is 668524841. The next prime is 668524919. The reversal of 668524870 is 78425866.

668524870 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 668524870.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 328797 + ... + 330823.

It is an arithmetic number, because the mean of its divisors is an integer number (21081060).

Almost surely, 2^668524870 is an apocalyptic number.

668524870 is an abundant number, since it is smaller than the sum of its proper divisors (680662970).

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

668524870 is a wasteful number, since it uses less digits than its factorization.

668524870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2149.

The product of its (nonzero) digits is 645120, while the sum is 46.

The square root of 668524870 is about 25855.8478878570. The cubic root of 668524870 is about 874.3913568668.

The spelling of 668524870 in words is "six hundred sixty-eight million, five hundred twenty-four thousand, eight hundred seventy".