668513740 has 12 divisors (see below), whose sum is σ = 1403878896. Its totient is φ = 267405488.

The previous prime is 668513737. The next prime is 668513753. The reversal of 668513740 is 47315866.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 668513693 and 668513702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16712824 + ... + 16712863.

It is an arithmetic number, because the mean of its divisors is an integer number (116989908).

Almost surely, 2^668513740 is an apocalyptic number.

It is an amenable number.

668513740 is an abundant number, since it is smaller than the sum of its proper divisors (735365156).

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

668513740 is a wasteful number, since it uses less digits than its factorization.

668513740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33425696 (or 33425694 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 668513740 is about 25855.6326551875. The cubic root of 668513740 is about 874.3865043773.

The spelling of 668513740 in words is "six hundred sixty-eight million, five hundred thirteen thousand, seven hundred forty".