668725304 has 48 divisors (see below), whose sum is σ = 1395482760. Its totient is φ = 298641600.

The previous prime is 668725289. The next prime is 668725307. The reversal of 668725304 is 403527866.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668725307) 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, 96599 + ... + 103289.

Almost surely, 2^668725304 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668725304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (697741380).

668725304 is an abundant number, since it is smaller than the sum of its proper divisors (726757456).

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

668725304 is a wasteful number, since it uses less digits than its factorization.

668725304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6772 (or 6737 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 41.

The square root of 668725304 is about 25859.7235870765. The cubic root of 668725304 is about 874.4787334442.

The spelling of 668725304 in words is "six hundred sixty-eight million, seven hundred twenty-five thousand, three hundred four".