668986244 has 12 divisors (see below), whose sum is σ = 1239592284. Its totient is φ = 314817024.

The previous prime is 668986237. The next prime is 668986259. The reversal of 668986244 is 442689866.

It can be written as a sum of positive squares in 2 ways, for example, as 210598144 + 458388100 = 14512^2 + 21410^2 .

It is a super-2 number, since 2×668986244² = 895085189322455072, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4918949 + ... + 4919084.

It is an arithmetic number, because the mean of its divisors is an integer number (103299357).

Almost surely, 2^668986244 is an apocalyptic number.

It is an amenable number.

668986244 is a deficient number, since it is larger than the sum of its proper divisors (570606040).

668986244 is a wasteful number, since it uses less digits than its factorization.

668986244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9838054 (or 9838052 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 53.

The square root of 668986244 is about 25864.7683925451. The cubic root of 668986244 is about 874.5924606632.

The spelling of 668986244 in words is "six hundred sixty-eight million, nine hundred eighty-six thousand, two hundred forty-four".