687860 has 24 divisors (see below), whose sum is σ = 1460256. Its totient is φ = 272160.

The previous prime is 687847. The next prime is 687893. The reversal of 687860 is 68786.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 687860.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 3155 + ... + 3365.

It is an arithmetic number, because the mean of its divisors is an integer number (60844).

2⁶⁸⁷⁸⁶⁰ is an apocalyptic number.

It is an amenable number.

687860 is an abundant number, since it is smaller than the sum of its proper divisors (772396).

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

687860 is a wasteful number, since it uses less digits than its factorization.

687860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383 (or 381 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 687860 is about 829.3732573456. The cubic root of 687860 is about 88.2741108514.

The spelling of 687860 in words is "six hundred eighty-seven thousand, eight hundred sixty".