81223032 has 64 divisors (see below), whose sum is σ = 222393600. Its totient is φ = 24515840.

The previous prime is 81223031. The next prime is 81223049. The reversal of 81223032 is 23032218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81223031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94348 + ... + 95204.

It is an arithmetic number, because the mean of its divisors is an integer number (3474900).

Almost surely, 2^81223032 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81223032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111196800).

81223032 is an abundant number, since it is smaller than the sum of its proper divisors (141170568).

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

81223032 is a wasteful number, since it uses less digits than its factorization.

81223032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236 (or 1232 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 81223032 is about 9012.3821490214. The cubic root of 81223032 is about 433.0716279089.

The spelling of 81223032 in words is "eighty-one million, two hundred twenty-three thousand, thirty-two".