685505 has 8 divisors (see below), whose sum is σ = 834624. Its totient is φ = 540400.

The previous prime is 685493. The next prime is 685511. The reversal of 685505 is 505586.

685505 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 not a de Polignac number, because 685505 - 2⁸ = 685249 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 611 + ... + 1320.

It is an arithmetic number, because the mean of its divisors is an integer number (104328).

2⁶⁸⁵⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

685505 is a deficient number, since it is larger than the sum of its proper divisors (149119).

685505 is a wasteful number, since it uses less digits than its factorization.

685505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2007.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 685505 is about 827.9522933116. The cubic root of 685505 is about 88.1732554319.

The spelling of 685505 in words is "six hundred eighty-five thousand, five hundred five".