217873868 has 12 divisors (see below), whose sum is σ = 394427040. Its totient is φ = 105180432.

The previous prime is 217873861. The next prime is 217873933. The reversal of 217873868 is 868378712.

It is not an unprimeable number, because it can be changed into a prime (217873861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 938996 + ... + 939227.

It is an arithmetic number, because the mean of its divisors is an integer number (32868920).

Almost surely, 2^217873868 is an apocalyptic number.

It is an amenable number.

217873868 is a deficient number, since it is larger than the sum of its proper divisors (176553172).

217873868 is a wasteful number, since it uses less digits than its factorization.

217873868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878256 (or 1878254 counting only the distinct ones).

The product of its digits is 903168, while the sum is 50.

The square root of 217873868 is about 14760.5510737235. The cubic root of 217873868 is about 601.7300696002.

The spelling of 217873868 in words is "two hundred seventeen million, eight hundred seventy-three thousand, eight hundred sixty-eight".