81528304132868 has 24 divisors (see below), whose sum is σ = 143227975258368. Its totient is φ = 40606049199296.

The previous prime is 81528304132861. The next prime is 81528304133039. The reversal of 81528304132868 is 86823140382518.

It is not an unprimeable number, because it can be changed into a prime (81528304132861) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10827080 + ... + 16741632.

It is an arithmetic number, because the mean of its divisors is an integer number (5967832302432).

Almost surely, 2^{81528304132868} is an apocalyptic number.

It is an amenable number.

81528304132868 is a deficient number, since it is larger than the sum of its proper divisors (61699671125500).

81528304132868 is a wasteful number, since it uses less digits than its factorization.

81528304132868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5927923 (or 5927921 counting only the distinct ones).

The product of its (nonzero) digits is 17694720, while the sum is 59.

The spelling of 81528304132868 in words is "eighty-one trillion, five hundred twenty-eight billion, three hundred four million, one hundred thirty-two thousand, eight hundred sixty-eight".