81396822 has 24 divisors (see below), whose sum is σ = 176281704. Its totient is φ = 25044864.

The previous prime is 81396773. The next prime is 81396827. The reversal of 81396822 is 22869318.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81396827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39123 + ... + 41150.

It is an arithmetic number, because the mean of its divisors is an integer number (7345071).

Almost surely, 2^81396822 is an apocalyptic number.

81396822 is an abundant number, since it is smaller than the sum of its proper divisors (94884882).

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

81396822 is a wasteful number, since it uses less digits than its factorization.

81396822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80304 (or 80291 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 81396822 is about 9022.0187319690. The cubic root of 81396822 is about 433.3802838018.

The spelling of 81396822 in words is "eighty-one million, three hundred ninety-six thousand, eight hundred twenty-two".