81835582728 has 32 divisors (see below), whose sum is σ = 204679101600. Its totient is φ = 27266508288.

The previous prime is 81835582723. The next prime is 81835582781. The reversal of 81835582728 is 82728553818.

It is not an unprimeable number, because it can be changed into a prime (81835582721) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 695518 + ... + 804621.

It is an arithmetic number, because the mean of its divisors is an integer number (6396221925).

Almost surely, 2^81835582728 is an apocalyptic number.

It is an amenable number.

81835582728 is an abundant number, since it is smaller than the sum of its proper divisors (122843518872).

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

81835582728 is a wasteful number, since it uses less digits than its factorization.

81835582728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1502421 (or 1502417 counting only the distinct ones).

The product of its digits is 8601600, while the sum is 57.

The spelling of 81835582728 in words is "eighty-one billion, eight hundred thirty-five million, five hundred eighty-two thousand, seven hundred twenty-eight".