81422944 has 24 divisors (see below), whose sum is σ = 167272560. Its totient is φ = 38941056.

The previous prime is 81422933. The next prime is 81422947. The reversal of 81422944 is 44922418.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81422947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54579 + ... + 56050.

It is an arithmetic number, because the mean of its divisors is an integer number (6969690).

Almost surely, 2^81422944 is an apocalyptic number.

It is an amenable number.

81422944 is an abundant number, since it is smaller than the sum of its proper divisors (85849616).

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

81422944 is a wasteful number, since it uses less digits than its factorization.

81422944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110662 (or 110654 counting only the distinct ones).

The product of its digits is 18432, while the sum is 34.

The square root of 81422944 is about 9023.4662962744. The cubic root of 81422944 is about 433.4266392109.

The spelling of 81422944 in words is "eighty-one million, four hundred twenty-two thousand, nine hundred forty-four".