87111985684 has 72 divisors (see below), whose sum is σ = 164834059320. Its totient is φ = 40267628544.

The previous prime is 87111985627. The next prime is 87111985693. The reversal of 87111985684 is 48658911178.

It can be written as a sum of positive squares in 12 ways, for example, as 646583184 + 86465402500 = 25428^2 + 294050^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16150092 + ... + 16155484.

It is an arithmetic number, because the mean of its divisors is an integer number (2289361935).

Almost surely, 2^87111985684 is an apocalyptic number.

It is an amenable number.

87111985684 is a deficient number, since it is larger than the sum of its proper divisors (77722073636).

87111985684 is a wasteful number, since it uses less digits than its factorization.

87111985684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5677 (or 5658 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 58.

The spelling of 87111985684 in words is "eighty-seven billion, one hundred eleven million, nine hundred eighty-five thousand, six hundred eighty-four".