686544 has 20 divisors (see below), whose sum is σ = 1773696. Its totient is φ = 228832.

The previous prime is 686519. The next prime is 686551. The reversal of 686544 is 445686.

It is a happy number.

686544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7104 + ... + 7199.

2⁶⁸⁶⁵⁴⁴ is an apocalyptic number.

It is an amenable number.

686544 is an abundant number, since it is smaller than the sum of its proper divisors (1087152).

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

686544 is a wasteful number, since it uses less digits than its factorization.

686544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14314 (or 14308 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 686544 is about 828.5795073498. The cubic root of 686544 is about 88.2177801578.

The spelling of 686544 in words is "six hundred eighty-six thousand, five hundred forty-four".