216700218 has 64 divisors (see below), whose sum is σ = 557061120. Its totient is φ = 61159536.

The previous prime is 216700217. The next prime is 216700219. The reversal of 216700218 is 812007612.

It is an interprime number because it is at equal distance from previous prime (216700217) and next prime (216700219).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 216700191 and 216700200.

It is not an unprimeable number, because it can be changed into a prime (216700217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27921 + ... + 34827.

It is an arithmetic number, because the mean of its divisors is an integer number (8704080).

Almost surely, 2^216700218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216700218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278530560).

216700218 is an abundant number, since it is smaller than the sum of its proper divisors (340360902).

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

216700218 is a wasteful number, since it uses less digits than its factorization.

216700218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7008 (or 7002 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 216700218 is about 14720.7410818885. The cubic root of 216700218 is about 600.6476506628.

The spelling of 216700218 in words is "two hundred sixteen million, seven hundred thousand, two hundred eighteen".