81894327084 has 36 divisors (see below), whose sum is σ = 207176515000. Its totient is φ = 27276238080.

The previous prime is 81894327083. The next prime is 81894327127. The reversal of 81894327084 is 48072349818.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 81894327084.

It is not an unprimeable number, because it can be changed into a prime (81894327083) 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 11 ways as a sum of consecutive naturals, for example, 865702 + ... + 955629.

Almost surely, 2^81894327084 is an apocalyptic number.

It is an amenable number.

81894327084 is an abundant number, since it is smaller than the sum of its proper divisors (125282187916).

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

81894327084 is a wasteful number, since it uses less digits than its factorization.

81894327084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1822590 (or 1822585 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The spelling of 81894327084 in words is "eighty-one billion, eight hundred ninety-four million, three hundred twenty-seven thousand, eighty-four".