668213224 has 16 divisors (see below), whose sum is σ = 1431885600. Its totient is φ = 286377072.

The previous prime is 668213219. The next prime is 668213233. The reversal of 668213224 is 422312866.

It is a self number, because there is not a number n which added to its sum of digits gives 668213224.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5966134 + ... + 5966245.

It is an arithmetic number, because the mean of its divisors is an integer number (89492850).

Almost surely, 2^668213224 is an apocalyptic number.

It is an amenable number.

668213224 is an abundant number, since it is smaller than the sum of its proper divisors (763672376).

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

668213224 is a wasteful number, since it uses less digits than its factorization.

668213224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11932392 (or 11932388 counting only the distinct ones).

The product of its digits is 27648, while the sum is 34.

The square root of 668213224 is about 25849.8205796481. The cubic root of 668213224 is about 874.2554641794.

The spelling of 668213224 in words is "six hundred sixty-eight million, two hundred thirteen thousand, two hundred twenty-four".