81732232878 has 16 divisors (see below), whose sum is σ = 163742947200. Its totient is φ = 27197664056.

The previous prime is 81732232877. The next prime is 81732232921. The reversal of 81732232878 is 87823223718.

It is a self number, because there is not a number n which added to its sum of digits gives 81732232878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81732232877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11599578 + ... + 11606621.

It is an arithmetic number, because the mean of its divisors is an integer number (10233934200).

Almost surely, 2^81732232878 is an apocalyptic number.

81732232878 is an abundant number, since it is smaller than the sum of its proper divisors (82010714322).

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

81732232878 is a wasteful number, since it uses less digits than its factorization.

81732232878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23206791.

The product of its digits is 1806336, while the sum is 51.

The spelling of 81732232878 in words is "eighty-one billion, seven hundred thirty-two million, two hundred thirty-two thousand, eight hundred seventy-eight".