81836160 has 128 divisors (see below), whose sum is σ = 298166400. Its totient is φ = 18702336.

The previous prime is 81836141. The next prime is 81836177. The reversal of 81836160 is 6163818.

It is a tau number, because it is divible by the number of its divisors (128).

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, 10396 + ... + 16484.

It is an arithmetic number, because the mean of its divisors is an integer number (2329425).

Almost surely, 2^81836160 is an apocalyptic number.

81836160 is a gapful number since it is divisible by the number (80) 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 81836160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149083200).

81836160 is an abundant number, since it is smaller than the sum of its proper divisors (216330240).

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

81836160 is a wasteful number, since it uses less digits than its factorization.

81836160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6118 (or 6106 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 81836160 is about 9046.3340641389. The cubic root of 81836160 is about 434.1586061200.

Adding to 81836160 its reverse (6163818), we get a palindrome (87999978).

The spelling of 81836160 in words is "eighty-one million, eight hundred thirty-six thousand, one hundred sixty".