81167832 has 96 divisors (see below), whose sum is σ = 233513280. Its totient is φ = 26399520.

The previous prime is 81167813. The next prime is 81167833. The reversal of 81167832 is 23876118.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81167833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83107 + ... + 84077.

It is an arithmetic number, because the mean of its divisors is an integer number (2432430).

Almost surely, 2^81167832 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 81167832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116756640).

81167832 is an abundant number, since it is smaller than the sum of its proper divisors (152345448).

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

81167832 is a wasteful number, since it uses less digits than its factorization.

81167832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035 (or 1019 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 81167832 is about 9009.3191751652. The cubic root of 81167832 is about 432.9734990457.

The spelling of 81167832 in words is "eighty-one million, one hundred sixty-seven thousand, eight hundred thirty-two".