218870636 has 12 divisors (see below), whose sum is σ = 386816640. Its totient is φ = 108351600.

The previous prime is 218870621. The next prime is 218870677. The reversal of 218870636 is 636078812.

It is a happy number.

218870636 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 218870593 and 218870602.

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, 270476 + ... + 271283.

It is an arithmetic number, because the mean of its divisors is an integer number (32234720).

Almost surely, 2^218870636 is an apocalyptic number.

It is an amenable number.

218870636 is a deficient number, since it is larger than the sum of its proper divisors (167946004).

218870636 is a wasteful number, since it uses less digits than its factorization.

218870636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541864 (or 541862 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 218870636 is about 14794.2771367850. The cubic root of 218870636 is about 602.6463075642.

The spelling of 218870636 in words is "two hundred eighteen million, eight hundred seventy thousand, six hundred thirty-six".