687879 has 16 divisors (see below), whose sum is σ = 1036000. Its totient is φ = 451008.

The previous prime is 687847. The next prime is 687893. The reversal of 687879 is 978786.

It is not a de Polignac number, because 687879 - 2⁵ = 687847 is a prime.

It is a Duffinian number.

687879 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1797 + ... + 2145.

It is an arithmetic number, because the mean of its divisors is an integer number (64750).

2⁶⁸⁷⁸⁷⁹ is an apocalyptic number.

687879 is a deficient number, since it is larger than the sum of its proper divisors (348121).

687879 is a wasteful number, since it uses less digits than its factorization.

687879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431 (or 425 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 687879 is about 829.3847116990. The cubic root of 687879 is about 88.2749236101.

The spelling of 687879 in words is "six hundred eighty-seven thousand, eight hundred seventy-nine".