218163968 has 54 divisors (see below), whose sum is σ = 478731372. Its totient is φ = 99151360.

The previous prime is 218163917. The next prime is 218163971. The reversal of 218163968 is 869361812.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27455 + ... + 34497.

Almost surely, 2^218163968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218163968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239365686).

218163968 is an abundant number, since it is smaller than the sum of its proper divisors (260567404).

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

218163968 is an equidigital number, since it uses as much as digits as its factorization.

218163968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7081 (or 7056 counting only the distinct ones).

The product of its digits is 124416, while the sum is 44.

The square root of 218163968 is about 14770.3746736500. The cubic root of 218163968 is about 601.9970198857.

The spelling of 218163968 in words is "two hundred eighteen million, one hundred sixty-three thousand, nine hundred sixty-eight".