687318329 has 4 divisors (see below), whose sum is σ = 709489920. Its totient is φ = 665146740.

The previous prime is 687318283. The next prime is 687318343. The reversal of 687318329 is 923813786.

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 a de Polignac number, because none of the positive numbers 2^k-687318329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687318389) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 11085749 + ... + 11085810.

It is an arithmetic number, because the mean of its divisors is an integer number (177372480).

Almost surely, 2^687318329 is an apocalyptic number.

It is an amenable number.

687318329 is a deficient number, since it is larger than the sum of its proper divisors (22171591).

687318329 is a wasteful number, since it uses less digits than its factorization.

687318329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22171590.

The product of its digits is 435456, while the sum is 47.

The square root of 687318329 is about 26216.7566453213. The cubic root of 687318329 is about 882.5093361450.

The spelling of 687318329 in words is "six hundred eighty-seven million, three hundred eighteen thousand, three hundred twenty-nine".