218561228 has 12 divisors (see below), whose sum is σ = 382755912. Its totient is φ = 109202400.

The previous prime is 218561219. The next prime is 218561243. The reversal of 218561228 is 822165812.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13025 + ... + 24632.

It is an arithmetic number, because the mean of its divisors is an integer number (31896326).

Almost surely, 2^218561228 is an apocalyptic number.

It is an amenable number.

218561228 is a deficient number, since it is larger than the sum of its proper divisors (164194684).

218561228 is a wasteful number, since it uses less digits than its factorization.

218561228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39112 (or 39110 counting only the distinct ones).

The product of its digits is 15360, while the sum is 35.

The square root of 218561228 is about 14783.8164220204. The cubic root of 218561228 is about 602.3621952587.

The spelling of 218561228 in words is "two hundred eighteen million, five hundred sixty-one thousand, two hundred twenty-eight".