686164 has 6 divisors (see below), whose sum is σ = 1200794. Its totient is φ = 343080.

The previous prime is 686149. The next prime is 686173. The reversal of 686164 is 461686.

It can be written as a sum of positive squares in only one way, i.e., 501264 + 184900 = 708^2 + 430^2 .

It is a super-3 number, since 3×686164³ = 969181333765136832, which contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85767 + ... + 85774.

2⁶⁸⁶¹⁶⁴ is an apocalyptic number.

It is an amenable number.

686164 is a deficient number, since it is larger than the sum of its proper divisors (514630).

686164 is a wasteful number, since it uses less digits than its factorization.

686164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171545 (or 171543 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 686164 is about 828.3501675016. The cubic root of 686164 is about 88.2015010637.

The spelling of 686164 in words is "six hundred eighty-six thousand, one hundred sixty-four".