81886176 has 72 divisors (see below), whose sum is σ = 234476424. Its totient is φ = 27106560.

The previous prime is 81886163. The next prime is 81886177. The reversal of 81886176 is 67168818.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81886177) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44311 + ... + 46121.

It is an arithmetic number, because the mean of its divisors is an integer number (3256617).

Almost surely, 2^81886176 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 81886176, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117238212).

81886176 is an abundant number, since it is smaller than the sum of its proper divisors (152590248).

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

81886176 is a wasteful number, since it uses less digits than its factorization.

81886176 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1984 (or 1973 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 81886176 is about 9049.0980766041. The cubic root of 81886176 is about 434.2470366887.

The spelling of 81886176 in words is "eighty-one million, eight hundred eighty-six thousand, one hundred seventy-six".