81995022 has 24 divisors (see below), whose sum is σ = 178506120. Its totient is φ = 27200880.

The previous prime is 81995021. The next prime is 81995057. The reversal of 81995022 is 22059918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81995021) 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, 6997 + ... + 14592.

It is an arithmetic number, because the mean of its divisors is an integer number (7437755).

Almost surely, 2^81995022 is an apocalyptic number.

81995022 is an abundant number, since it is smaller than the sum of its proper divisors (96511098).

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

81995022 is a wasteful number, since it uses less digits than its factorization.

81995022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21808 (or 21805 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 81995022 is about 9055.1102698973. The cubic root of 81995022 is about 434.4393570051.

The spelling of 81995022 in words is "eighty-one million, nine hundred ninety-five thousand, twenty-two".