218308228 has 6 divisors (see below), whose sum is σ = 382039406. Its totient is φ = 109154112.

The previous prime is 218308213. The next prime is 218308229. The reversal of 218308228 is 822803812.

It can be written as a sum of positive squares in only one way, i.e., 179345664 + 38962564 = 13392^2 + 6242^2 .

It is a junction number, because it is equal to n+sod(n) for n = 218308193 and 218308202.

It is not an unprimeable number, because it can be changed into a prime (218308229) 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 as a sum of consecutive naturals, namely, 27288525 + ... + 27288532.

Almost surely, 2^218308228 is an apocalyptic number.

It is an amenable number.

218308228 is a deficient number, since it is larger than the sum of its proper divisors (163731178).

218308228 is a wasteful number, since it uses less digits than its factorization.

218308228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54577061 (or 54577059 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 218308228 is about 14775.2572904840. The cubic root of 218308228 is about 602.1296799764.

The spelling of 218308228 in words is "two hundred eighteen million, three hundred eight thousand, two hundred twenty-eight".