81704682852 has 24 divisors (see below), whose sum is σ = 205309203456. Its totient is φ = 25139902368.

The previous prime is 81704682823. The next prime is 81704682859. The reversal of 81704682852 is 25828640718.

It is a junction number, because it is equal to n+sod(n) for n = 81704682795 and 81704682804.

It is not an unprimeable number, because it can be changed into a prime (81704682859) 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, 261873828 + ... + 261874139.

It is an arithmetic number, because the mean of its divisors is an integer number (8554550144).

Almost surely, 2^81704682852 is an apocalyptic number.

It is an amenable number.

81704682852 is an abundant number, since it is smaller than the sum of its proper divisors (123604520604).

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

81704682852 is a wasteful number, since it uses less digits than its factorization.

81704682852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523747987 (or 523747985 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 51.

The spelling of 81704682852 in words is "eighty-one billion, seven hundred four million, six hundred eighty-two thousand, eight hundred fifty-two".