81892694 has 32 divisors (see below), whose sum is σ = 137682720. Its totient is φ = 36271872.

The previous prime is 81892691. The next prime is 81892721. The reversal of 81892694 is 49629818.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81892691) 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 15 ways as a sum of consecutive naturals, for example, 235829 + ... + 236175.

It is an arithmetic number, because the mean of its divisors is an integer number (4302585).

Almost surely, 2^81892694 is an apocalyptic number.

81892694 is a deficient number, since it is larger than the sum of its proper divisors (55790026).

81892694 is a wasteful number, since it uses less digits than its factorization.

81892694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704.

The product of its digits is 248832, while the sum is 47.

The square root of 81892694 is about 9049.4582158271. The cubic root of 81892694 is about 434.2585581576.

The spelling of 81892694 in words is "eighty-one million, eight hundred ninety-two thousand, six hundred ninety-four".