680643 has 12 divisors (see below), whose sum is σ = 1019928. Its totient is φ = 453600.

The previous prime is 680633. The next prime is 680651. The reversal of 680643 is 346086.

It is not a de Polignac number, because 680643 - 2⁵ = 680611 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 680643.

It is not an unprimeable number, because it can be changed into a prime (680623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1158 + ... + 1643.

It is an arithmetic number, because the mean of its divisors is an integer number (84994).

2⁶⁸⁰⁶⁴³ is an apocalyptic number.

680643 is a deficient number, since it is larger than the sum of its proper divisors (339285).

680643 is an equidigital number, since it uses as much as digits as its factorization.

680643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2816 (or 2804 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 680643 is about 825.0109090188. The cubic root of 680643 is about 87.9643019808.

The spelling of 680643 in words is "six hundred eighty thousand, six hundred forty-three".