687567 has 4 divisors (see below), whose sum is σ = 916760. Its totient is φ = 458376.

The previous prime is 687559. The next prime is 687581. The reversal of 687567 is 765786.

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

It is not a de Polignac number, because 687567 - 2³ = 687559 is a prime.

It is a D-number.

It is a Duffinian number.

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 687567.

It is not an unprimeable number, because it can be changed into a prime (687517) 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, 114592 + ... + 114597.

It is an arithmetic number, because the mean of its divisors is an integer number (229190).

2⁶⁸⁷⁵⁶⁷ is an apocalyptic number.

687567 is a deficient number, since it is larger than the sum of its proper divisors (229193).

687567 is a wasteful number, since it uses less digits than its factorization.

687567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229192.

The product of its digits is 70560, while the sum is 39.

The square root of 687567 is about 829.1965991247. The cubic root of 687567 is about 88.2615753608.

The spelling of 687567 in words is "six hundred eighty-seven thousand, five hundred sixty-seven".