871993738687 has 4 divisors (see below), whose sum is σ = 886773293640. Its totient is φ = 857214183736.

The previous prime is 871993738669. The next prime is 871993738709. The reversal of 871993738687 is 786837399178.

It is a happy number.

871993738687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 786837399178 = 2 ⋅393418699589.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-871993738687 is a prime.

It is a Smith number, since the sum of its digits (76) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871993738607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7389777388 + ... + 7389777505.

It is an arithmetic number, because the mean of its divisors is an integer number (221693323410).

Almost surely, 2^871993738687 is an apocalyptic number.

871993738687 is a deficient number, since it is larger than the sum of its proper divisors (14779554953).

871993738687 is a wasteful number, since it uses less digits than its factorization.

871993738687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14779554952.

The product of its digits is 768144384, while the sum is 76.

The spelling of 871993738687 in words is "eight hundred seventy-one billion, nine hundred ninety-three million, seven hundred thirty-eight thousand, six hundred eighty-seven".