87819981876 has 36 divisors (see below), whose sum is σ = 242170254144. Its totient is φ = 26612115600.

The previous prime is 87819981839. The next prime is 87819981901. The reversal of 87819981876 is 67818991878.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 110883420 + ... + 110884211.

It is an arithmetic number, because the mean of its divisors is an integer number (6726951504).

Almost surely, 2^87819981876 is an apocalyptic number.

It is an amenable number.

87819981876 is an abundant number, since it is smaller than the sum of its proper divisors (154350272268).

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

87819981876 is a wasteful number, since it uses less digits than its factorization.

87819981876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221767652 (or 221767647 counting only the distinct ones).

The product of its digits is 97542144, while the sum is 72.

The spelling of 87819981876 in words is "eighty-seven billion, eight hundred nineteen million, nine hundred eighty-one thousand, eight hundred seventy-six".