668573928 has 96 divisors (see below), whose sum is σ = 1984357440. Its totient is φ = 201672960.

The previous prime is 668573923. The next prime is 668573953. The reversal of 668573928 is 829375866.

It is a happy number.

668573928 is a `hidden beast` number, since 6 + 68 + 573 + 9 + 2 + 8 = 666.

668573928 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (668573923) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 182725 + ... + 186347.

It is an arithmetic number, because the mean of its divisors is an integer number (20670390).

Almost surely, 2^668573928 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 668573928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (992178720).

668573928 is an abundant number, since it is smaller than the sum of its proper divisors (1315783512).

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

668573928 is a wasteful number, since it uses less digits than its factorization.

668573928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3879 (or 3872 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The square root of 668573928 is about 25856.7965533242. The cubic root of 668573928 is about 874.4127446735.

The spelling of 668573928 in words is "six hundred sixty-eight million, five hundred seventy-three thousand, nine hundred twenty-eight".