81968922 has 120 divisors (see below), whose sum is σ = 220158048. Its totient is φ = 22317120.

The previous prime is 81968903. The next prime is 81968989. The reversal of 81968922 is 22986918.

Its product of digits (124416) is a multiple of the sum of its prime divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1906233 + ... + 1906275.

Almost surely, 2^81968922 is an apocalyptic number.

81968922 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 81968922, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110079024).

81968922 is an abundant number, since it is smaller than the sum of its proper divisors (138189126).

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

81968922 is a wasteful number, since it uses less digits than its factorization.

81968922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 96 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 81968922 is about 9053.6689800323. The cubic root of 81968922 is about 434.3932563588.

The spelling of 81968922 in words is "eighty-one million, nine hundred sixty-eight thousand, nine hundred twenty-two".