687844 has 12 divisors (see below), whose sum is σ = 1209600. Its totient is φ = 342248.

The previous prime is 687839. The next prime is 687847. The reversal of 687844 is 448786.

It is not an unprimeable number, because it can be changed into a prime (687847) 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, 1197 + ... + 1675.

It is an arithmetic number, because the mean of its divisors is an integer number (100800).

2⁶⁸⁷⁸⁴⁴ is an apocalyptic number.

It is an amenable number.

687844 is a deficient number, since it is larger than the sum of its proper divisors (521756).

687844 is a wasteful number, since it uses less digits than its factorization.

687844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842 (or 840 counting only the distinct ones).

The product of its digits is 43008, while the sum is 37.

The square root of 687844 is about 829.3636114516. The cubic root of 687844 is about 88.2734264114.

The spelling of 687844 in words is "six hundred eighty-seven thousand, eight hundred forty-four".