81696382704 has 160 divisors (see below), whose sum is σ = 254804326400. Its totient is φ = 24966558720.

The previous prime is 81696382619. The next prime is 81696382709. The reversal of 81696382704 is 40728369618.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81696382709) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93912 + ... + 414984.

It is an arithmetic number, because the mean of its divisors is an integer number (1592527040).

Almost surely, 2^81696382704 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 81696382704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127402163200).

81696382704 is an abundant number, since it is smaller than the sum of its proper divisors (173107943696).

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

81696382704 is a wasteful number, since it uses less digits than its factorization.

81696382704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321140 (or 321128 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The spelling of 81696382704 in words is "eighty-one billion, six hundred ninety-six million, three hundred eighty-two thousand, seven hundred four".