668807214 has 32 divisors (see below), whose sum is σ = 1354177440. Its totient is φ = 220188672.

The previous prime is 668807213. The next prime is 668807219. The reversal of 668807214 is 412708866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668807213) 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, 229414 + ... + 232310.

It is an arithmetic number, because the mean of its divisors is an integer number (42318045).

Almost surely, 2^668807214 is an apocalyptic number.

668807214 is an abundant number, since it is smaller than the sum of its proper divisors (685370226).

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

668807214 is a wasteful number, since it uses less digits than its factorization.

668807214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3364.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 668807214 is about 25861.3072755420. The cubic root of 668807214 is about 874.5144360107.

The spelling of 668807214 in words is "six hundred sixty-eight million, eight hundred seven thousand, two hundred fourteen".