181800216 has 96 divisors (see below), whose sum is σ = 542702160. Its totient is φ = 54625536.

The previous prime is 181800209. The next prime is 181800221. The reversal of 181800216 is 612008181.

It is a self number, because there is not a number n which added to its sum of digits gives 181800216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37990 + ... + 42506.

Almost surely, 2^181800216 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 181800216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271351080).

181800216 is an abundant number, since it is smaller than the sum of its proper divisors (360901944).

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

181800216 is a wasteful number, since it uses less digits than its factorization.

181800216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4585 (or 4578 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 181800216 is about 13483.3310424390. The cubic root of 181800216 is about 566.4976747907.

Adding to 181800216 its reverse (612008181), we get a palindrome (793808397).

The spelling of 181800216 in words is "one hundred eighty-one million, eight hundred thousand, two hundred sixteen".