81923922 has 24 divisors (see below), whose sum is σ = 178401600. Its totient is φ = 27169560.

The previous prime is 81923921. The next prime is 81923939. The reversal of 81923922 is 22932918.

It is a super-3 number, since 3×81923922³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (81923921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7854 + ... + 15017.

It is an arithmetic number, because the mean of its divisors is an integer number (7433400).

Almost surely, 2^81923922 is an apocalyptic number.

81923922 is an abundant number, since it is smaller than the sum of its proper divisors (96477678).

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

81923922 is a wasteful number, since it uses less digits than its factorization.

81923922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23078 (or 23075 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 81923922 is about 9051.1834585318. The cubic root of 81923922 is about 434.3137494989.

The spelling of 81923922 in words is "eighty-one million, nine hundred twenty-three thousand, nine hundred twenty-two".