668194304 has 40 divisors (see below), whose sum is σ = 1339287048. Its totient is φ = 333045760.

The previous prime is 668194271. The next prime is 668194309. The reversal of 668194304 is 403491866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668194309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175784 + ... + 179544.

Almost surely, 2^668194304 is an apocalyptic number.

668194304 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668194304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (669643524).

668194304 is an abundant number, since it is smaller than the sum of its proper divisors (671092744).

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

668194304 is an equidigital number, since it uses as much as digits as its factorization.

668194304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4126 (or 4110 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 668194304 is about 25849.4546170707. The cubic root of 668194304 is about 874.2472127865.

The spelling of 668194304 in words is "six hundred sixty-eight million, one hundred ninety-four thousand, three hundred four".