72117868 has 12 divisors (see below), whose sum is σ = 127935640. Its totient is φ = 35564832.

The previous prime is 72117853. The next prime is 72117887. The reversal of 72117868 is 86871127.

It is a self number, because there is not a number n which added to its sum of digits gives 72117868.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123198 + ... + 123781.

Almost surely, 2^72117868 is an apocalyptic number.

It is an amenable number.

72117868 is a deficient number, since it is larger than the sum of its proper divisors (55817772).

72117868 is a wasteful number, since it uses less digits than its factorization.

72117868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247056 (or 247054 counting only the distinct ones).

The product of its digits is 37632, while the sum is 40.

The square root of 72117868 is about 8492.2239725528. The cubic root of 72117868 is about 416.2436550299.

The spelling of 72117868 in words is "seventy-two million, one hundred seventeen thousand, eight hundred sixty-eight".