668838912 has 176 divisors, whose sum is σ = 2145911040. Its totient is φ = 180928512.

The previous prime is 668838901. The next prime is 668838913. The reversal of 668838912 is 219838866.

It is not an unprimeable number, because it can be changed into a prime (668838913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 407758 + ... + 409394.

Almost surely, 2^668838912 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 668838912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1072955520).

668838912 is an abundant number, since it is smaller than the sum of its proper divisors (1477072128).

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

668838912 is a wasteful number, since it uses less digits than its factorization.

668838912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686 (or 1668 counting only the distinct ones).

The product of its digits is 995328, while the sum is 51.

The square root of 668838912 is about 25861.9201143303. The cubic root of 668838912 is about 874.5282516116.

The spelling of 668838912 in words is "six hundred sixty-eight million, eight hundred thirty-eight thousand, nine hundred twelve".