81067388844 has 288 divisors, whose sum is σ = 229207527360. Its totient is φ = 22165014528.

The previous prime is 81067388819. The next prime is 81067388849. The reversal of 81067388844 is 44888376018.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (81067388849) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 276680362 + ... + 276680654.

It is an arithmetic number, because the mean of its divisors is an integer number (795859470).

Almost surely, 2^81067388844 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 81067388844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114603763680).

81067388844 is an abundant number, since it is smaller than the sum of its proper divisors (148140138516).

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

81067388844 is a wasteful number, since it uses less digits than its factorization.

81067388844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402 (or 347 counting only the distinct ones).

The product of its (nonzero) digits is 8257536, while the sum is 57.

The spelling of 81067388844 in words is "eighty-one billion, sixty-seven million, three hundred eighty-eight thousand, eight hundred forty-four".