81173682 has 24 divisors (see below), whose sum is σ = 177587904. Its totient is φ = 26794584.

The previous prime is 81173669. The next prime is 81173689. The reversal of 81173682 is 28637118.

It is not an unprimeable number, because it can be changed into a prime (81173689) 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, 20038 + ... + 23745.

It is an arithmetic number, because the mean of its divisors is an integer number (7399496).

Almost surely, 2^81173682 is an apocalyptic number.

81173682 is an abundant number, since it is smaller than the sum of its proper divisors (96414222).

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

81173682 is a wasteful number, since it uses less digits than its factorization.

81173682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43894 (or 43891 counting only the distinct ones).

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

The square root of 81173682 is about 9009.6438331379. The cubic root of 81173682 is about 432.9839006792.

The spelling of 81173682 in words is "eighty-one million, one hundred seventy-three thousand, six hundred eighty-two".