81056682280 has 128 divisors (see below), whose sum is σ = 209973772800. Its totient is φ = 27585911808.

The previous prime is 81056682277. The next prime is 81056682341. The reversal of 81056682280 is 8228665018.

It is a self number, because there is not a number n which added to its sum of digits gives 81056682280.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28074997 + ... + 28077883.

It is an arithmetic number, because the mean of its divisors is an integer number (1640420100).

Almost surely, 2^81056682280 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 81056682280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104986886400).

81056682280 is an abundant number, since it is smaller than the sum of its proper divisors (128917090520).

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

81056682280 is a wasteful number, since it uses less digits than its factorization.

81056682280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3611 (or 3607 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 46.

The spelling of 81056682280 in words is "eighty-one billion, fifty-six million, six hundred eighty-two thousand, two hundred eighty".