81590022 has 24 divisors (see below), whose sum is σ = 178532640. Its totient is φ = 26926800.

The previous prime is 81590017. The next prime is 81590029. The reversal of 81590022 is 22009518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81590029) 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, 20622 + ... + 24257.

It is an arithmetic number, because the mean of its divisors is an integer number (7438860).

Almost surely, 2^81590022 is an apocalyptic number.

81590022 is an abundant number, since it is smaller than the sum of its proper divisors (96942618).

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

81590022 is a wasteful number, since it uses less digits than its factorization.

81590022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44988 (or 44985 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 81590022 is about 9032.7195240415. The cubic root of 81590022 is about 433.7228971485.

The spelling of 81590022 in words is "eighty-one million, five hundred ninety thousand, twenty-two".