686512 has 20 divisors (see below), whose sum is σ = 1345896. Its totient is φ = 339200.

The previous prime is 686503. The next prime is 686513. The reversal of 686512 is 215686.

686512 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×686512² = 942597452288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (686513) 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, 1512 + ... + 1912.

2⁶⁸⁶⁵¹² is an apocalyptic number.

It is an amenable number.

686512 is a deficient number, since it is larger than the sum of its proper divisors (659384).

686512 is a wasteful number, since it uses less digits than its factorization.

686512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516 (or 510 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 686512 is about 828.5601969682. The cubic root of 686512 is about 88.2164095184.

The spelling of 686512 in words is "six hundred eighty-six thousand, five hundred twelve".