218251228 has 12 divisors (see below), whose sum is σ = 411319720. Its totient is φ = 100731312.

The previous prime is 218251223. The next prime is 218251249. The reversal of 218251228 is 822152812.

218251228 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 218251228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218251223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2098518 + ... + 2098621.

Almost surely, 2^218251228 is an apocalyptic number.

It is an amenable number.

218251228 is a deficient number, since it is larger than the sum of its proper divisors (193068492).

218251228 is a wasteful number, since it uses less digits than its factorization.

218251228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4197156 (or 4197154 counting only the distinct ones).

The product of its digits is 5120, while the sum is 31.

The square root of 218251228 is about 14773.3282641387. The cubic root of 218251228 is about 602.0772703175.

The spelling of 218251228 in words is "two hundred eighteen million, two hundred fifty-one thousand, two hundred twenty-eight".