81922938 has 16 divisors (see below), whose sum is σ = 164570400. Its totient is φ = 27186896.

The previous prime is 81922873. The next prime is 81922957. The reversal of 81922938 is 83922918.

It is a super-2 number, since 2×81922938² = 13422735541103688, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81922938.

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, 28713 + ... + 31436.

It is an arithmetic number, because the mean of its divisors is an integer number (10285650).

Almost surely, 2^81922938 is an apocalyptic number.

81922938 is an abundant number, since it is smaller than the sum of its proper divisors (82647462).

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

81922938 is a wasteful number, since it uses less digits than its factorization.

81922938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60381.

The product of its digits is 62208, while the sum is 42.

The square root of 81922938 is about 9051.1291008360. The cubic root of 81922938 is about 434.3120106237.

The spelling of 81922938 in words is "eighty-one million, nine hundred twenty-two thousand, nine hundred thirty-eight".