686696 has 8 divisors (see below), whose sum is σ = 1287570. Its totient is φ = 343344.

The previous prime is 686687. The next prime is 686723. The reversal of 686696 is 696686.

686696 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 422500 + 264196 = 650^2 + 514^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 686696.

It is an unprimeable number.

686696 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42911 + ... + 42926.

2⁶⁸⁶⁶⁹⁶ is an apocalyptic number.

It is an amenable number.

686696 is a deficient number, since it is larger than the sum of its proper divisors (600874).

686696 is a wasteful number, since it uses less digits than its factorization.

686696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85843 (or 85839 counting only the distinct ones).

The product of its digits is 93312, while the sum is 41.

The square root of 686696 is about 828.6712255171. The cubic root of 686696 is about 88.2242901136.

The spelling of 686696 in words is "six hundred eighty-six thousand, six hundred ninety-six".