81326160 has 160 divisors (see below), whose sum is σ = 292481280. Its totient is φ = 20731392.

The previous prime is 81326159. The next prime is 81326171. The reversal of 81326160 is 6162318.

It is a super-2 number, since 2×81326160² = 13227888600691200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48862 + ... + 50498.

It is an arithmetic number, because the mean of its divisors is an integer number (1828008).

Almost surely, 2^81326160 is an apocalyptic number.

81326160 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 81326160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146240640).

81326160 is an abundant number, since it is smaller than the sum of its proper divisors (211155120).

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

81326160 is a wasteful number, since it uses less digits than its factorization.

81326160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1682 (or 1670 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 81326160 is about 9018.1017958326. The cubic root of 81326160 is about 433.2548391683.

Adding to 81326160 its reverse (6162318), we get a palindrome (87488478).

The spelling of 81326160 in words is "eighty-one million, three hundred twenty-six thousand, one hundred sixty".