81432727596 has 120 divisors (see below), whose sum is σ = 234365780880. Its totient is φ = 24450076800.

The previous prime is 81432727561. The next prime is 81432727601. The reversal of 81432727596 is 69572723418.

It is a happy number.

81432727596 is a `hidden beast` number, since 8 + 1 + 4 + 3 + 27 + 27 + 596 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 39 ways as a sum of consecutive naturals, for example, 283666 + ... + 493286.

It is an arithmetic number, because the mean of its divisors is an integer number (1953048174).

Almost surely, 2^81432727596 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81432727596, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117182890440).

81432727596 is an abundant number, since it is smaller than the sum of its proper divisors (152933053284).

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

81432727596 is a wasteful number, since it uses less digits than its factorization.

81432727596 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209757 (or 209746 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

The spelling of 81432727596 in words is "eighty-one billion, four hundred thirty-two million, seven hundred twenty-seven thousand, five hundred ninety-six".