218766216 has 16 divisors (see below), whose sum is σ = 546915600. Its totient is φ = 72922064.

The previous prime is 218766211. The next prime is 218766221. The reversal of 218766216 is 612667812.

It is an interprime number because it is at equal distance from previous prime (218766211) and next prime (218766221).

It is not an unprimeable number, because it can be changed into a prime (218766211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4557606 + ... + 4557653.

It is an arithmetic number, because the mean of its divisors is an integer number (34182225).

Almost surely, 2^218766216 is an apocalyptic number.

It is an amenable number.

218766216 is an abundant number, since it is smaller than the sum of its proper divisors (328149384).

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

218766216 is a wasteful number, since it uses less digits than its factorization.

218766216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9115268 (or 9115264 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

The square root of 218766216 is about 14790.7476484456. The cubic root of 218766216 is about 602.5504543871.

The spelling of 218766216 in words is "two hundred eighteen million, seven hundred sixty-six thousand, two hundred sixteen".