81067954432 has 72 divisors (see below), whose sum is σ = 162979729920. Its totient is φ = 40244152320.

The previous prime is 81067954343. The next prime is 81067954459. The reversal of 81067954432 is 23445976018.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31927819 + ... + 31930357.

It is an arithmetic number, because the mean of its divisors is an integer number (2263607360).

It is a 1-persistent number, because it is pandigital, but 2⋅81067954432 = 162135908864 is not.

Almost surely, 2^81067954432 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 81067954432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81489864960).

81067954432 is an abundant number, since it is smaller than the sum of its proper divisors (81911775488).

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

81067954432 is a wasteful number, since it uses less digits than its factorization.

81067954432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3399 (or 3385 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 81067954432 in words is "eighty-one billion, sixty-seven million, nine hundred fifty-four thousand, four hundred thirty-two".