687959 has 4 divisors (see below), whose sum is σ = 693504. Its totient is φ = 682416.

The previous prime is 687949. The next prime is 687961. The reversal of 687959 is 959786.

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 687959 - 2¹² = 683863 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 (687949) 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, 2582 + ... + 2835.

It is an arithmetic number, because the mean of its divisors is an integer number (173376).

2⁶⁸⁷⁹⁵⁹ is an apocalyptic number.

687959 is a deficient number, since it is larger than the sum of its proper divisors (5545).

687959 is a wasteful number, since it uses less digits than its factorization.

687959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5544.

The product of its digits is 136080, while the sum is 44.

The square root of 687959 is about 829.4329388203. The cubic root of 687959 is about 88.2783455880.

The spelling of 687959 in words is "six hundred eighty-seven thousand, nine hundred fifty-nine".