81085432308 has 96 divisors (see below), whose sum is σ = 203832115200. Its totient is φ = 25007216256.

The previous prime is 81085432291. The next prime is 81085432357. The reversal of 81085432308 is 80323458018.

It is a self number, because there is not a number n which added to its sum of digits gives 81085432308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5125066 + ... + 5140862.

It is an arithmetic number, because the mean of its divisors is an integer number (2123251200).

Almost surely, 2^81085432308 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 81085432308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101916057600).

81085432308 is an abundant number, since it is smaller than the sum of its proper divisors (122746682892).

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

81085432308 is a wasteful number, since it uses less digits than its factorization.

81085432308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16349 (or 16347 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 42.

The spelling of 81085432308 in words is "eighty-one billion, eighty-five million, four hundred thirty-two thousand, three hundred eight".