687259 has 4 divisors (see below), whose sum is σ = 727704. Its totient is φ = 646816.

The previous prime is 687233. The next prime is 687277. The reversal of 687259 is 952786.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 687259 - 2⁷ = 687131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687289) 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, 20197 + ... + 20230.

It is an arithmetic number, because the mean of its divisors is an integer number (181926).

2⁶⁸⁷²⁵⁹ is an apocalyptic number.

687259 is a deficient number, since it is larger than the sum of its proper divisors (40445).

687259 is a wasteful number, since it uses less digits than its factorization.

687259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40444.

The product of its digits is 30240, while the sum is 37.

The square root of 687259 is about 829.0108563825. The cubic root of 687259 is about 88.2483942815.

It can be divided in two parts, 687 and 259, that added together give a triangular number (946 = T₄₃).

The spelling of 687259 in words is "six hundred eighty-seven thousand, two hundred fifty-nine".