181642216 has 48 divisors (see below), whose sum is σ = 404654400. Its totient is φ = 76182624.

The previous prime is 181642207. The next prime is 181642231. The reversal of 181642216 is 612246181.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13495 + ... + 23353.

It is an arithmetic number, because the mean of its divisors is an integer number (8430300).

Almost surely, 2^181642216 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 181642216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (202327200).

181642216 is an abundant number, since it is smaller than the sum of its proper divisors (223012184).

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

181642216 is a wasteful number, since it uses less digits than its factorization.

181642216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9926 (or 9915 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 181642216 is about 13477.4706825873. The cubic root of 181642216 is about 566.3335155160. Note that the first 3 decimals are identical.

Adding to 181642216 its reverse (612246181), we get a palindrome (793888397).

The spelling of 181642216 in words is "one hundred eighty-one million, six hundred forty-two thousand, two hundred sixteen".