81075832140 has 96 divisors (see below), whose sum is σ = 249350008320. Its totient is φ = 19591773696.

The previous prime is 81075832139. The next prime is 81075832153. The reversal of 81075832140 is 4123857018.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1519849 + ... + 1572288.

It is an arithmetic number, because the mean of its divisors is an integer number (2597395920).

Almost surely, 2^81075832140 is an apocalyptic number.

It is an amenable number.

81075832140 is an abundant number, since it is smaller than the sum of its proper divisors (168274176180).

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

81075832140 is a wasteful number, since it uses less digits than its factorization.

81075832140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3092191 (or 3092189 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 39.

The spelling of 81075832140 in words is "eighty-one billion, seventy-five million, eight hundred thirty-two thousand, one hundred forty".