668908224 has 84 divisors (see below), whose sum is σ = 2018248440. Its totient is φ = 211230720.

The previous prime is 668908213. The next prime is 668908259. The reversal of 668908224 is 422809866.

It is a self number, because there is not a number n which added to its sum of digits gives 668908224.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 19617 + ... + 41504.

Almost surely, 2^668908224 is an apocalyptic number.

668908224 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

668908224 is an abundant number, since it is smaller than the sum of its proper divisors (1349340216).

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

668908224 is a wasteful number, since it uses less digits than its factorization.

668908224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61158 (or 61145 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 668908224 is about 25863.2601193276. The cubic root of 668908224 is about 874.5584597864.

The spelling of 668908224 in words is "six hundred sixty-eight million, nine hundred eight thousand, two hundred twenty-four".