668388974 has 16 divisors (see below), whose sum is σ = 1116999936. Its totient is φ = 297348600.

The previous prime is 668388961. The next prime is 668388977. The reversal of 668388974 is 479883866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668388977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322172 + ... + 324239.

It is an arithmetic number, because the mean of its divisors is an integer number (69812496).

Almost surely, 2^668388974 is an apocalyptic number.

668388974 is a deficient number, since it is larger than the sum of its proper divisors (448610962).

668388974 is a wasteful number, since it uses less digits than its factorization.

668388974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646471.

The product of its digits is 13934592, while the sum is 59.

The square root of 668388974 is about 25853.2197994757. The cubic root of 668388974 is about 874.3321048501.

The spelling of 668388974 in words is "six hundred sixty-eight million, three hundred eighty-eight thousand, nine hundred seventy-four".