687855 has 16 divisors (see below), whose sum is σ = 1257984. Its totient is φ = 314400.

The previous prime is 687847. The next prime is 687893. The reversal of 687855 is 558786.

It is a happy number.

It is not a de Polignac number, because 687855 - 2³ = 687847 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3171 + ... + 3380.

It is an arithmetic number, because the mean of its divisors is an integer number (78624).

2⁶⁸⁷⁸⁵⁵ is an apocalyptic number.

687855 is a deficient number, since it is larger than the sum of its proper divisors (570129).

687855 is a wasteful number, since it uses less digits than its factorization.

687855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6566.

The product of its digits is 67200, while the sum is 39.

The square root of 687855 is about 829.3702430157. The cubic root of 687855 is about 88.2738969650.

The spelling of 687855 in words is "six hundred eighty-seven thousand, eight hundred fifty-five".