217670868 has 48 divisors (see below), whose sum is σ = 583800000. Its totient is φ = 70053984.

The previous prime is 217670861. The next prime is 217670881. The reversal of 217670868 is 868076712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217670861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31618 + ... + 37881.

It is an arithmetic number, because the mean of its divisors is an integer number (12162500).

Almost surely, 2^217670868 is an apocalyptic number.

It is an amenable number.

217670868 is an abundant number, since it is smaller than the sum of its proper divisors (366129132).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217670868 is a wasteful number, since it uses less digits than its factorization.

217670868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69541 (or 69533 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 217670868 is about 14753.6730341973. The cubic root of 217670868 is about 601.5431278583.

The spelling of 217670868 in words is "two hundred seventeen million, six hundred seventy thousand, eight hundred sixty-eight".