81986874328 has 32 divisors (see below), whose sum is σ = 157322365200. Its totient is φ = 40034510208.

The previous prime is 81986874247. The next prime is 81986874337. The reversal of 81986874328 is 82347868918.

It is a self number, because there is not a number n which added to its sum of digits gives 81986874328.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 3576150 + ... + 3599002.

Almost surely, 2^81986874328 is an apocalyptic number.

It is an amenable number.

81986874328 is a deficient number, since it is larger than the sum of its proper divisors (75335490872).

81986874328 is a wasteful number, since it uses less digits than its factorization.

81986874328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33331 (or 33327 counting only the distinct ones).

The product of its digits is 37158912, while the sum is 64.

The spelling of 81986874328 in words is "eighty-one billion, nine hundred eighty-six million, eight hundred seventy-four thousand, three hundred twenty-eight".