81223674 has 48 divisors (see below), whose sum is σ = 189703296. Its totient is φ = 23116800.

The previous prime is 81223663. The next prime is 81223687. The reversal of 81223674 is 47632218.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126394 + ... + 127034.

It is an arithmetic number, because the mean of its divisors is an integer number (3952152).

Almost surely, 2^81223674 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81223674, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94851648).

81223674 is an abundant number, since it is smaller than the sum of its proper divisors (108479622).

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

81223674 is a wasteful number, since it uses less digits than its factorization.

81223674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091 (or 1084 counting only the distinct ones).

The product of its digits is 16128, while the sum is 33.

The square root of 81223674 is about 9012.4177666151. The cubic root of 81223674 is about 433.0727689287.

The spelling of 81223674 in words is "eighty-one million, two hundred twenty-three thousand, six hundred seventy-four".