218227668 has 24 divisors (see below), whose sum is σ = 526757280. Its totient is φ = 70234080.

The previous prime is 218227661. The next prime is 218227679. The reversal of 218227668 is 866722812.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218227661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313198 + ... + 313893.

It is an arithmetic number, because the mean of its divisors is an integer number (21948220).

Almost surely, 2^218227668 is an apocalyptic number.

It is an amenable number.

218227668 is an abundant number, since it is smaller than the sum of its proper divisors (308529612).

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

218227668 is a wasteful number, since it uses less digits than its factorization.

218227668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627127 (or 627125 counting only the distinct ones).

The product of its digits is 129024, while the sum is 42.

The square root of 218227668 is about 14772.5308596733. The cubic root of 218227668 is about 602.0556049932.

The spelling of 218227668 in words is "two hundred eighteen million, two hundred twenty-seven thousand, six hundred sixty-eight".