685071 has 8 divisors (see below), whose sum is σ = 1014960. Its totient is φ = 456696.

The previous prime is 685063. The next prime is 685073. The reversal of 685071 is 170586.

685071 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 685071 - 2³ = 685063 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 25373 = 685071 / (6 + 8 + 5 + 0 + 7 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685073) 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, 12660 + ... + 12713.

It is an arithmetic number, because the mean of its divisors is an integer number (126870).

2⁶⁸⁵⁰⁷¹ is an apocalyptic number.

685071 is a deficient number, since it is larger than the sum of its proper divisors (329889).

685071 is a wasteful number, since it uses less digits than its factorization.

685071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25382 (or 25376 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 685071 is about 827.6901594196. The cubic root of 685071 is about 88.1546437167.

The spelling of 685071 in words is "six hundred eighty-five thousand, seventy-one".