218272816 has 20 divisors (see below), whose sum is σ = 432739912. Its totient is φ = 106598016.

The previous prime is 218272799. The next prime is 218272853. The reversal of 218272816 is 618272812.

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, 157941 + ... + 159316.

Almost surely, 2^218272816 is an apocalyptic number.

It is an amenable number.

218272816 is a deficient number, since it is larger than the sum of its proper divisors (214467096).

218272816 is a wasteful number, since it uses less digits than its factorization.

218272816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317308 (or 317302 counting only the distinct ones).

The product of its digits is 21504, while the sum is 37.

The square root of 218272816 is about 14774.0588871170. The cubic root of 218272816 is about 602.0971208596.

The spelling of 218272816 in words is "two hundred eighteen million, two hundred seventy-two thousand, eight hundred sixteen".