687858 has 8 divisors (see below), whose sum is σ = 1375728. Its totient is φ = 229284.

The previous prime is 687847. The next prime is 687893. The reversal of 687858 is 858786.

It is a happy number.

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

687858 is an admirable number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 687858.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57316 + ... + 57327.

It is an arithmetic number, because the mean of its divisors is an integer number (171966).

2⁶⁸⁷⁸⁵⁸ is an apocalyptic number.

687858 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

687858 is a wasteful number, since it uses less digits than its factorization.

687858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114648.

The product of its digits is 107520, while the sum is 42.

The square root of 687858 is about 829.3720516150. The cubic root of 687858 is about 88.2740252970.

The spelling of 687858 in words is "six hundred eighty-seven thousand, eight hundred fifty-eight".