81822686 has 16 divisors (see below), whose sum is σ = 135146880. Its totient is φ = 36843480.

The previous prime is 81822677. The next prime is 81822691. The reversal of 81822686 is 68622818.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 15026 + ... + 19733.

It is an arithmetic number, because the mean of its divisors is an integer number (8446680).

Almost surely, 2^81822686 is an apocalyptic number.

81822686 is a deficient number, since it is larger than the sum of its proper divisors (53324194).

81822686 is a wasteful number, since it uses less digits than its factorization.

81822686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34879.

The product of its digits is 73728, while the sum is 41.

The square root of 81822686 is about 9045.5893119243. The cubic root of 81822686 is about 434.1347773132.

The spelling of 81822686 in words is "eighty-one million, eight hundred twenty-two thousand, six hundred eighty-six".