81023922 has 64 divisors (see below), whose sum is σ = 208742400. Its totient is φ = 22816080.

The previous prime is 81023881. The next prime is 81023927. The reversal of 81023922 is 22932018.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (81023927) 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 31 ways as a sum of consecutive naturals, for example, 25329 + ... + 28347.

It is an arithmetic number, because the mean of its divisors is an integer number (3261600).

Almost surely, 2^81023922 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81023922, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104371200).

81023922 is an abundant number, since it is smaller than the sum of its proper divisors (127718478).

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

81023922 is a wasteful number, since it uses less digits than its factorization.

81023922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3108 (or 3102 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 81023922 is about 9001.3289018900. The cubic root of 81023922 is about 432.7174613370.

The spelling of 81023922 in words is "eighty-one million, twenty-three thousand, nine hundred twenty-two".