81976822 has 16 divisors (see below), whose sum is σ = 130870080. Its totient is φ = 38378368.

The previous prime is 81976819. The next prime is 81976861. The reversal of 81976822 is 22867918.

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 7 ways as a sum of consecutive naturals, for example, 579 + ... + 12817.

It is an arithmetic number, because the mean of its divisors is an integer number (8179380).

Almost surely, 2^81976822 is an apocalyptic number.

81976822 is a deficient number, since it is larger than the sum of its proper divisors (48893258).

81976822 is a wasteful number, since it uses less digits than its factorization.

81976822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12455.

The product of its digits is 96768, while the sum is 43.

The square root of 81976822 is about 9054.1052567330. The cubic root of 81976822 is about 434.4072112269.

The spelling of 81976822 in words is "eighty-one million, nine hundred seventy-six thousand, eight hundred twenty-two".