686575 has 12 divisors (see below), whose sum is σ = 881640. Its totient is φ = 529760.

The previous prime is 686563. The next prime is 686593. The reversal of 686575 is 575686.

It is not a de Polignac number, because 686575 - 2¹¹ = 684527 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 252 + ... + 1198.

It is an arithmetic number, because the mean of its divisors is an integer number (73470).

2⁶⁸⁶⁵⁷⁵ is an apocalyptic number.

686575 is a deficient number, since it is larger than the sum of its proper divisors (195065).

686575 is a wasteful number, since it uses less digits than its factorization.

686575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986 (or 981 counting only the distinct ones).

The product of its digits is 50400, while the sum is 37.

The square root of 686575 is about 828.5982138528. The cubic root of 686575 is about 88.2191079242.

Subtracting from 686575 its reverse (575686), we obtain a square (110889 = 333²).

The spelling of 686575 in words is "six hundred eighty-six thousand, five hundred seventy-five".