218519868 has 72 divisors (see below), whose sum is σ = 602345856. Its totient is φ = 60397920.

The previous prime is 218519867. The next prime is 218519869. The reversal of 218519868 is 868915812.

218519868 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (218519867) and next prime (218519869).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218519867) 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 23 ways as a sum of consecutive naturals, for example, 79371 + ... + 82077.

Almost surely, 2^218519868 is an apocalyptic number.

218519868 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218519868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (301172928).

218519868 is an abundant number, since it is smaller than the sum of its proper divisors (383825988).

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

218519868 is a wasteful number, since it uses less digits than its factorization.

218519868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2783 (or 2750 counting only the distinct ones).

The product of its digits is 276480, while the sum is 48.

The square root of 218519868 is about 14782.4175289430. The cubic root of 218519868 is about 602.3241963384.

The spelling of 218519868 in words is "two hundred eighteen million, five hundred nineteen thousand, eight hundred sixty-eight".