668382872 has 8 divisors (see below), whose sum is σ = 1253217900. Its totient is φ = 334191432.

The previous prime is 668382833. The next prime is 668382881. The reversal of 668382872 is 278283866.

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

It is a self number, because there is not a number n which added to its sum of digits gives 668382872.

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, 41773922 + ... + 41773937.

Almost surely, 2^668382872 is an apocalyptic number.

It is an amenable number.

668382872 is a deficient number, since it is larger than the sum of its proper divisors (584835028).

668382872 is a wasteful number, since it uses less digits than its factorization.

668382872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83547865 (or 83547861 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 50.

The square root of 668382872 is about 25853.1017868263. The cubic root of 668382872 is about 874.3294441286.

The spelling of 668382872 in words is "six hundred sixty-eight million, three hundred eighty-two thousand, eight hundred seventy-two".