81299480768 has 112 divisors (see below), whose sum is σ = 182787645600. Its totient is φ = 35550535680.

The previous prime is 81299480761. The next prime is 81299480791. The reversal of 81299480768 is 86708499218.

It is a self number, because there is not a number n which added to its sum of digits gives 81299480768.

It is not an unprimeable number, because it can be changed into a prime (81299480761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2300738 + ... + 2335806.

It is an arithmetic number, because the mean of its divisors is an integer number (1632032550).

Almost surely, 2^81299480768 is an apocalyptic number.

81299480768 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81299480768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91393822800).

81299480768 is an abundant number, since it is smaller than the sum of its proper divisors (101488164832).

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

81299480768 is a wasteful number, since it uses less digits than its factorization.

81299480768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35218 (or 35208 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 62.

The spelling of 81299480768 in words is "eighty-one billion, two hundred ninety-nine million, four hundred eighty thousand, seven hundred sixty-eight".