685605 has 8 divisors (see below), whose sum is σ = 1096992. Its totient is φ = 365648.

The previous prime is 685591. The next prime is 685609. The reversal of 685605 is 506586.

685605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 685605 - 2⁶ = 685541 is a prime.

It is a super-3 number, since 3×685605³ = 966814562333460375, which contains 333 as substring.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22839 + ... + 22868.

It is an arithmetic number, because the mean of its divisors is an integer number (137124).

2⁶⁸⁵⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

685605 is a deficient number, since it is larger than the sum of its proper divisors (411387).

685605 is a wasteful number, since it uses less digits than its factorization.

685605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45715.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 685605 is about 828.0126810623. The cubic root of 685605 is about 88.1775427319.

The spelling of 685605 in words is "six hundred eighty-five thousand, six hundred five".