81167044 has 48 divisors (see below), whose sum is σ = 176117760. Its totient is φ = 31933440.

The previous prime is 81167039. The next prime is 81167057. The reversal of 81167044 is 44076118.

It is a junction number, because it is equal to n+sod(n) for n = 81166997 and 81167015.

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 15 ways as a sum of consecutive naturals, for example, 17437 + ... + 21595.

It is an arithmetic number, because the mean of its divisors is an integer number (3669120).

Almost surely, 2^81167044 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 81167044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88058880).

81167044 is an abundant number, since it is smaller than the sum of its proper divisors (94950716).

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

81167044 is a wasteful number, since it uses less digits than its factorization.

81167044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4228 (or 4226 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 81167044 is about 9009.2754425647. The cubic root of 81167044 is about 432.9720978986.

The spelling of 81167044 in words is "eighty-one million, one hundred sixty-seven thousand, forty-four".