668390598 has 24 divisors (see below), whose sum is σ = 1533367368. Its totient is φ = 209691072.

The previous prime is 668390563. The next prime is 668390599. The reversal of 668390598 is 895093866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668390599) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1091836 + ... + 1092447.

It is an arithmetic number, because the mean of its divisors is an integer number (63890307).

Almost surely, 2^668390598 is an apocalyptic number.

668390598 is an abundant number, since it is smaller than the sum of its proper divisors (864976770).

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

668390598 is a wasteful number, since it uses less digits than its factorization.

668390598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2184308 (or 2184305 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The square root of 668390598 is about 25853.2512075367. The cubic root of 668390598 is about 874.3328129778.

The spelling of 668390598 in words is "six hundred sixty-eight million, three hundred ninety thousand, five hundred ninety-eight".