687695 has 8 divisors (see below), whose sum is σ = 836160. Its totient is φ = 542880.

The previous prime is 687691. The next prime is 687707. The reversal of 687695 is 596786.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 687695 - 2² = 687691 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 687695.

It is not an unprimeable number, because it can be changed into a prime (687691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 476 + ... + 1265.

It is an arithmetic number, because the mean of its divisors is an integer number (104520).

2⁶⁸⁷⁶⁹⁵ is an apocalyptic number.

687695 is a deficient number, since it is larger than the sum of its proper divisors (148465).

687695 is a wasteful number, since it uses less digits than its factorization.

687695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825.

The product of its digits is 90720, while the sum is 41.

The square root of 687695 is about 829.2737786763. The cubic root of 687695 is about 88.2670520540.

Subtracting from 687695 its reverse (596786), we obtain a palindrome (90909).

The spelling of 687695 in words is "six hundred eighty-seven thousand, six hundred ninety-five".