687735815087 has 4 divisors (see below), whose sum is σ = 687740795040. Its totient is φ = 687730835136.

The previous prime is 687735815059. The next prime is 687735815089. The reversal of 687735815087 is 780518537786.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 687735815087 - 2³⁰ = 686662073263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687735815089) 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, 2276738 + ... + 2561055.

It is an arithmetic number, because the mean of its divisors is an integer number (171935198760).

Almost surely, 2^687735815087 is an apocalyptic number.

687735815087 is a deficient number, since it is larger than the sum of its proper divisors (4979953).

687735815087 is a wasteful number, since it uses less digits than its factorization.

687735815087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4979952.

The product of its (nonzero) digits is 79027200, while the sum is 65.

The spelling of 687735815087 in words is "six hundred eighty-seven billion, seven hundred thirty-five million, eight hundred fifteen thousand, eighty-seven".