680687 has 4 divisors (see below), whose sum is σ = 777936. Its totient is φ = 583440.

The previous prime is 680681. The next prime is 680707. The reversal of 680687 is 786086.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 680687 - 2⁶ = 680623 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a zygodrome in base 6.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 680687.

It is not an unprimeable number, because it can be changed into a prime (680681) 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, 48614 + ... + 48627.

It is an arithmetic number, because the mean of its divisors is an integer number (194484).

2⁶⁸⁰⁶⁸⁷ is an apocalyptic number.

680687 is a deficient number, since it is larger than the sum of its proper divisors (97249).

680687 is an equidigital number, since it uses as much as digits as its factorization.

680687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97248.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 680687 is about 825.0375749019. The cubic root of 680687 is about 87.9661974169.

The spelling of 680687 in words is "six hundred eighty thousand, six hundred eighty-seven".