680671 has 4 divisors (see below), whose sum is σ = 682344. Its totient is φ = 679000.

The previous prime is 680657. The next prime is 680681. The reversal of 680671 is 176086.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 680671 - 2⁹ = 680159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680611) 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, 216 + ... + 1186.

It is an arithmetic number, because the mean of its divisors is an integer number (170586).

2⁶⁸⁰⁶⁷¹ is an apocalyptic number.

680671 is a deficient number, since it is larger than the sum of its proper divisors (1673).

680671 is an equidigital number, since it uses as much as digits as its factorization.

680671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1672.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 680671 is about 825.0278783168. The cubic root of 680671 is about 87.9655081768.

The spelling of 680671 in words is "six hundred eighty thousand, six hundred seventy-one".