218280228 has 24 divisors (see below), whose sum is σ = 521744160. Its totient is φ = 70985280.

The previous prime is 218280217. The next prime is 218280229. The reversal of 218280228 is 822082812.

218280228 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (218280229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221338 + ... + 222321.

It is an arithmetic number, because the mean of its divisors is an integer number (21739340).

Almost surely, 2^218280228 is an apocalyptic number.

It is an amenable number.

218280228 is an abundant number, since it is smaller than the sum of its proper divisors (303463932).

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

218280228 is a wasteful number, since it uses less digits than its factorization.

218280228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443707 (or 443705 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 33.

The square root of 218280228 is about 14774.3097300686. The cubic root of 218280228 is about 602.1039360209.

The spelling of 218280228 in words is "two hundred eighteen million, two hundred eighty thousand, two hundred twenty-eight".