181326816 has 96 divisors (see below), whose sum is σ = 576979200. Its totient is φ = 54944640.

The previous prime is 181326809. The next prime is 181326839. The reversal of 181326816 is 618623181.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36 + ... + 19043.

It is an arithmetic number, because the mean of its divisors is an integer number (6010200).

Almost surely, 2^181326816 is an apocalyptic number.

181326816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181326816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288489600).

181326816 is an abundant number, since it is smaller than the sum of its proper divisors (395652384).

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

181326816 is a wasteful number, since it uses less digits than its factorization.

181326816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19109 (or 19095 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 181326816 is about 13465.7645902489. The cubic root of 181326816 is about 566.0055354543.

Adding to 181326816 its reverse (618623181), we get a palindrome (799949997).

The spelling of 181326816 in words is "one hundred eighty-one million, three hundred twenty-six thousand, eight hundred sixteen".