81696622 has 24 divisors (see below), whose sum is σ = 145593504. Its totient is φ = 34265952.

The previous prime is 81696617. The next prime is 81696623. The reversal of 81696622 is 22669618.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81696623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4263 + ... + 13474.

It is an arithmetic number, because the mean of its divisors is an integer number (6066396).

Almost surely, 2^81696622 is an apocalyptic number.

81696622 is a deficient number, since it is larger than the sum of its proper divisors (63896882).

81696622 is a wasteful number, since it uses less digits than its factorization.

81696622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17800 (or 17793 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 81696622 is about 9038.6183678702. The cubic root of 81696622 is about 433.9117059372.

The spelling of 81696622 in words is "eighty-one million, six hundred ninety-six thousand, six hundred twenty-two".