81236322 has 48 divisors (see below), whose sum is σ = 184541760. Its totient is φ = 25778016.

The previous prime is 81236321. The next prime is 81236329. The reversal of 81236322 is 22363218.

81236322 is a `hidden beast` number, since 8 + 1 + 23 + 632 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (81236321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 130929 + ... + 131547.

It is an arithmetic number, because the mean of its divisors is an integer number (3844620).

Almost surely, 2^81236322 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81236322, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92270880).

81236322 is an abundant number, since it is smaller than the sum of its proper divisors (103305438).

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

81236322 is a wasteful number, since it uses less digits than its factorization.

81236322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 967 (or 964 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 81236322 is about 9013.1194377973. The cubic root of 81236322 is about 433.0952468583.

The spelling of 81236322 in words is "eighty-one million, two hundred thirty-six thousand, three hundred twenty-two".