687659 has 8 divisors (see below), whose sum is σ = 791520. Its totient is φ = 585216.

The previous prime is 687647. The next prime is 687679. The reversal of 687659 is 956786.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 687659 - 2⁸ = 687403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1097 + ... + 1605.

It is an arithmetic number, because the mean of its divisors is an integer number (98940).

2⁶⁸⁷⁶⁵⁹ is an apocalyptic number.

687659 is a deficient number, since it is larger than the sum of its proper divisors (103861).

687659 is a wasteful number, since it uses less digits than its factorization.

687659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709.

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

The square root of 687659 is about 829.2520726534. The cubic root of 687659 is about 88.2655118028.

The spelling of 687659 in words is "six hundred eighty-seven thousand, six hundred fifty-nine".