685257 has 4 divisors (see below), whose sum is σ = 913680. Its totient is φ = 456836.

The previous prime is 685249. The next prime is 685271. The reversal of 685257 is 752586.

It is a happy number.

685257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 685257 - 2³ = 685249 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (685247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114207 + ... + 114212.

It is an arithmetic number, because the mean of its divisors is an integer number (228420).

2⁶⁸⁵²⁵⁷ is an apocalyptic number.

It is an amenable number.

685257 is a deficient number, since it is larger than the sum of its proper divisors (228423).

685257 is a wasteful number, since it uses less digits than its factorization.

685257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228422.

The product of its digits is 16800, while the sum is 33.

The square root of 685257 is about 827.8025126804. The cubic root of 685257 is about 88.1626211283.

The spelling of 685257 in words is "six hundred eighty-five thousand, two hundred fifty-seven".