668878744 has 8 divisors (see below), whose sum is σ = 1254147660. Its totient is φ = 334439368.

The previous prime is 668878739. The next prime is 668878751. The reversal of 668878744 is 447878866.

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 41804914 + ... + 41804929.

Almost surely, 2^668878744 is an apocalyptic number.

It is an amenable number.

668878744 is a deficient number, since it is larger than the sum of its proper divisors (585268916).

668878744 is a wasteful number, since it uses less digits than its factorization.

668878744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83609849 (or 83609845 counting only the distinct ones).

The product of its digits is 14450688, while the sum is 58.

The square root of 668878744 is about 25862.6901926308. The cubic root of 668878744 is about 874.5456118046.

The spelling of 668878744 in words is "six hundred sixty-eight million, eight hundred seventy-eight thousand, seven hundred forty-four".