81062831982 has 64 divisors (see below), whose sum is σ = 180699724800. Its totient is φ = 24032225280.

The previous prime is 81062831981. The next prime is 81062831999. The reversal of 81062831982 is 28913826018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81062831981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12804994 + ... + 12811322.

It is an arithmetic number, because the mean of its divisors is an integer number (2823433200).

Almost surely, 2^81062831982 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81062831982, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90349862400).

81062831982 is an abundant number, since it is smaller than the sum of its proper divisors (99636892818).

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

81062831982 is a wasteful number, since it uses less digits than its factorization.

81062831982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10521.

The product of its (nonzero) digits is 331776, while the sum is 48.

The spelling of 81062831982 in words is "eighty-one billion, sixty-two million, eight hundred thirty-one thousand, nine hundred eighty-two".