81727127088 has 40 divisors (see below), whose sum is σ = 223547732208. Its totient is φ = 25639882752.

The previous prime is 81727127063. The next prime is 81727127093. The reversal of 81727127088 is 88072172718.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 81727127088.

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 7 ways as a sum of consecutive naturals, for example, 50077081 + ... + 50078712.

Almost surely, 2^81727127088 is an apocalyptic number.

It is an amenable number.

81727127088 is an abundant number, since it is smaller than the sum of its proper divisors (141820605120).

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

81727127088 is a wasteful number, since it uses less digits than its factorization.

81727127088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100155821 (or 100155815 counting only the distinct ones).

The product of its (nonzero) digits is 702464, while the sum is 51.

The spelling of 81727127088 in words is "eighty-one billion, seven hundred twenty-seven million, one hundred twenty-seven thousand, eighty-eight".