81944444 has 12 divisors (see below), whose sum is σ = 144030600. Its totient is φ = 40792848.

The previous prime is 81944441. The next prime is 81944477. The reversal of 81944444 is 44444918.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81944398 and 81944407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81944441) 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, 43814 + ... + 45645.

It is an arithmetic number, because the mean of its divisors is an integer number (12002550).

Almost surely, 2^81944444 is an apocalyptic number.

It is an amenable number.

81944444 is a deficient number, since it is larger than the sum of its proper divisors (62086156).

81944444 is a wasteful number, since it uses less digits than its factorization.

81944444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89692 (or 89690 counting only the distinct ones).

The product of its digits is 73728, while the sum is 38.

The square root of 81944444 is about 9052.3170514515. The cubic root of 81944444 is about 434.3500117710.

The spelling of 81944444 in words is "eighty-one million, nine hundred forty-four thousand, four hundred forty-four".