218873216 has 32 divisors (see below), whose sum is σ = 436747680. Its totient is φ = 109258240.

The previous prime is 218873209. The next prime is 218873227. The reversal of 218873216 is 612378812.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 218873216.

It is a congruent number.

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, 115670 + ... + 117546.

It is an arithmetic number, because the mean of its divisors is an integer number (13648365).

Almost surely, 2^218873216 is an apocalyptic number.

It is an amenable number.

218873216 is a deficient number, since it is larger than the sum of its proper divisors (217874464).

218873216 is an equidigital number, since it uses as much as digits as its factorization.

218873216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2802 (or 2790 counting only the distinct ones).

The product of its digits is 32256, while the sum is 38.

The square root of 218873216 is about 14794.3643324071. The cubic root of 218873216 is about 602.6486755099.

The spelling of 218873216 in words is "two hundred eighteen million, eight hundred seventy-three thousand, two hundred sixteen".