81386622 has 24 divisors (see below), whose sum is σ = 177231600. Its totient is φ = 26991360.

The previous prime is 81386609. The next prime is 81386651. The reversal of 81386622 is 22668318.

It is a congruent number.

It is an unprimeable number.

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, 7779 + ... + 14942.

It is an arithmetic number, because the mean of its divisors is an integer number (7384650).

Almost surely, 2^81386622 is an apocalyptic number.

81386622 is an abundant number, since it is smaller than the sum of its proper divisors (95844978).

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

81386622 is a wasteful number, since it uses less digits than its factorization.

81386622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22928 (or 22925 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 81386622 is about 9021.4534305731. The cubic root of 81386622 is about 433.3621804596.

The spelling of 81386622 in words is "eighty-one million, three hundred eighty-six thousand, six hundred twenty-two".