216684234 has 80 divisors (see below), whose sum is σ = 539911680. Its totient is φ = 64501920.

The previous prime is 216684229. The next prime is 216684253. The reversal of 216684234 is 432486612.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 63627 + ... + 66945.

It is an arithmetic number, because the mean of its divisors is an integer number (6748896).

Almost surely, 2^216684234 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216684234, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269955840).

216684234 is an abundant number, since it is smaller than the sum of its proper divisors (323227446).

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

216684234 is a wasteful number, since it uses less digits than its factorization.

216684234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3377 (or 3368 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 216684234 is about 14720.1981644270. The cubic root of 216684234 is about 600.6328821988.

The spelling of 216684234 in words is "two hundred sixteen million, six hundred eighty-four thousand, two hundred thirty-four".