81272932804872 has 48 divisors (see below), whose sum is σ = 220376546208000. Its totient is φ = 27058687977696.

The previous prime is 81272932804867. The next prime is 81272932804883. The reversal of 81272932804872 is 27840823927218.

81272932804872 is a `hidden beast` number, since 8 + 1 + 2 + 72 + 9 + 3 + 2 + 80 + 487 + 2 = 666.

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 11 ways as a sum of consecutive naturals, for example, 672639672 + ... + 672760487.

It is an arithmetic number, because the mean of its divisors is an integer number (4591178046000).

Almost surely, 2^{81272932804872} is an apocalyptic number.

It is an amenable number.

81272932804872 is an abundant number, since it is smaller than the sum of its proper divisors (139103613403128).

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

81272932804872 is a wasteful number, since it uses less digits than its factorization.

81272932804872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345401010 (or 1345401003 counting only the distinct ones).

The product of its (nonzero) digits is 43352064, while the sum is 63.

The spelling of 81272932804872 in words is "eighty-one trillion, two hundred seventy-two billion, nine hundred thirty-two million, eight hundred four thousand, eight hundred seventy-two".