687379517 has 4 divisors (see below), whose sum is σ = 749868576. Its totient is φ = 624890460.

The previous prime is 687379501. The next prime is 687379519. The reversal of 687379517 is 715973786.

687379517 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 687379517 - 2⁴ = 687379501 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 (687379519) 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, 31244513 + ... + 31244534.

It is an arithmetic number, because the mean of its divisors is an integer number (187467144).

Almost surely, 2^687379517 is an apocalyptic number.

It is an amenable number.

687379517 is a deficient number, since it is larger than the sum of its proper divisors (62489059).

687379517 is a wasteful number, since it uses less digits than its factorization.

687379517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62489058.

The product of its digits is 2222640, while the sum is 53.

The square root of 687379517 is about 26217.9235829232. The cubic root of 687379517 is about 882.5355236124.

The spelling of 687379517 in words is "six hundred eighty-seven million, three hundred seventy-nine thousand, five hundred seventeen".