218218056 has 64 divisors (see below), whose sum is σ = 625658880. Its totient is φ = 62130240.

The previous prime is 218218037. The next prime is 218218061. The reversal of 218218056 is 650812812.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49461 + ... + 53691.

It is an arithmetic number, because the mean of its divisors is an integer number (9775920).

Almost surely, 2^218218056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218218056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (312829440).

218218056 is an abundant number, since it is smaller than the sum of its proper divisors (407440824).

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

218218056 is a wasteful number, since it uses less digits than its factorization.

218218056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4554 (or 4550 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 218218056 is about 14772.2055225345. The cubic root of 218218056 is about 602.0467655344.

The spelling of 218218056 in words is "two hundred eighteen million, two hundred eighteen thousand, fifty-six".