685677 has 4 divisors (see below), whose sum is σ = 914240. Its totient is φ = 457116.

The previous prime is 685669. The next prime is 685679. The reversal of 685677 is 776586.

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 not a de Polignac number, because 685677 - 2³ = 685669 is a prime.

It is a D-number.

It is a Duffinian number.

685677 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685679) 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, 114277 + ... + 114282.

It is an arithmetic number, because the mean of its divisors is an integer number (228560).

2⁶⁸⁵⁶⁷⁷ is an apocalyptic number.

It is an amenable number.

685677 is a deficient number, since it is larger than the sum of its proper divisors (228563).

685677 is a wasteful number, since it uses less digits than its factorization.

685677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228562.

The product of its digits is 70560, while the sum is 39.

The square root of 685677 is about 828.0561575159. The cubic root of 685677 is about 88.1806293298.

Subtracting 685677 from its reverse (776586), we obtain a palindrome (90909).

The spelling of 685677 in words is "six hundred eighty-five thousand, six hundred seventy-seven".