668804286 has 16 divisors (see below), whose sum is σ = 1349447184. Its totient is φ = 220961664.

The previous prime is 668804239. The next prime is 668804291. The reversal of 668804286 is 682408866.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 492541 + ... + 493896.

It is an arithmetic number, because the mean of its divisors is an integer number (84340449).

Almost surely, 2^668804286 is an apocalyptic number.

668804286 is an abundant number, since it is smaller than the sum of its proper divisors (680642898).

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

668804286 is a wasteful number, since it uses less digits than its factorization.

668804286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986555.

The product of its (nonzero) digits is 884736, while the sum is 48.

The square root of 668804286 is about 25861.2506658127. The cubic root of 668804286 is about 874.5131598173.

The spelling of 668804286 in words is "six hundred sixty-eight million, eight hundred four thousand, two hundred eighty-six".