81085056 has 128 divisors (see below), whose sum is σ = 238761600. Its totient is φ = 24219648.

The previous prime is 81085033. The next prime is 81085061. The reversal of 81085056 is 65058018.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184485 + ... + 184923.

It is an arithmetic number, because the mean of its divisors is an integer number (1865325).

Almost surely, 2^81085056 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 81085056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119380800).

81085056 is an abundant number, since it is smaller than the sum of its proper divisors (157676544).

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

81085056 is a wasteful number, since it uses less digits than its factorization.

81085056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 33.

The square root of 81085056 is about 9004.7240934967. The cubic root of 81085056 is about 432.8262650012.

The spelling of 81085056 in words is "eighty-one million, eighty-five thousand, fifty-six".