216324918 has 96 divisors (see below), whose sum is σ = 517367520. Its totient is φ = 67814496.

The previous prime is 216324907. The next prime is 216324919. The reversal of 216324918 is 819423612.

216324918 is a `hidden beast` number, since 2 + 1 + 632 + 4 + 9 + 18 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216324919) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1578946 + ... + 1579082.

It is an arithmetic number, because the mean of its divisors is an integer number (5389245).

Almost surely, 2^216324918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216324918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258683760).

216324918 is an abundant number, since it is smaller than the sum of its proper divisors (301042602).

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

216324918 is an equidigital number, since it uses as much as digits as its factorization.

216324918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 161 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 216324918 is about 14707.9882376891. The cubic root of 216324918 is about 600.3006992747.

The spelling of 216324918 in words is "two hundred sixteen million, three hundred twenty-four thousand, nine hundred eighteen".