668438264 has 24 divisors (see below), whose sum is σ = 1357149960. Its totient is φ = 308509344.

The previous prime is 668438261. The next prime is 668438299. The reversal of 668438264 is 462834866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668438261) 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 5 ways as a sum of consecutive naturals, for example, 245852 + ... + 248555.

It is an arithmetic number, because the mean of its divisors is an integer number (56547915).

Almost surely, 2^668438264 is an apocalyptic number.

It is an amenable number.

668438264 is an abundant number, since it is smaller than the sum of its proper divisors (688711696).

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

668438264 is a wasteful number, since it uses less digits than its factorization.

668438264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494439 (or 494422 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 47.

The square root of 668438264 is about 25854.1730480787. The cubic root of 668438264 is about 874.3535967118.

The spelling of 668438264 in words is "six hundred sixty-eight million, four hundred thirty-eight thousand, two hundred sixty-four".