671685 has 16 divisors (see below), whose sum is σ = 1228416. Its totient is φ = 307008.

The previous prime is 671681. The next prime is 671701. The reversal of 671685 is 586176.

671685 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 671685 - 2² = 671681 is a prime.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3094 + ... + 3303.

It is an arithmetic number, because the mean of its divisors is an integer number (76776).

2⁶⁷¹⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

671685 is a deficient number, since it is larger than the sum of its proper divisors (556731).

671685 is a wasteful number, since it uses less digits than its factorization.

671685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6412.

The product of its digits is 10080, while the sum is 33.

The square root of 671685 is about 819.5639084294. The cubic root of 671685 is about 87.5766946615.

The spelling of 671685 in words is "six hundred seventy-one thousand, six hundred eighty-five".