81289582592 has 48 divisors (see below), whose sum is σ = 162636102720. Its totient is φ = 40620630016.

The previous prime is 81289582579. The next prime is 81289582597. The reversal of 81289582592 is 29528598218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81289582597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3722618 + ... + 3744390.

It is an arithmetic number, because the mean of its divisors is an integer number (3388252140).

Almost surely, 2^81289582592 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 81289582592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81318051360).

81289582592 is an abundant number, since it is smaller than the sum of its proper divisors (81346520128).

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

81289582592 is a wasteful number, since it uses less digits than its factorization.

81289582592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23618 (or 23598 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 59.

The spelling of 81289582592 in words is "eighty-one billion, two hundred eighty-nine million, five hundred eighty-two thousand, five hundred ninety-two".