680745 has 16 divisors (see below), whose sum is σ = 1173312. Its totient is φ = 335040.

The previous prime is 680707. The next prime is 680749. The reversal of 680745 is 547086.

It is a happy number.

It is not a de Polignac number, because 680745 - 2⁶ = 680681 is a prime.

It is a Curzon number.

680745 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680749) 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, 1551 + ... + 1940.

It is an arithmetic number, because the mean of its divisors is an integer number (73332).

2⁶⁸⁰⁷⁴⁵ is an apocalyptic number.

680745 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

680745 is a deficient number, since it is larger than the sum of its proper divisors (492567).

680745 is a wasteful number, since it uses less digits than its factorization.

680745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3512.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 680745 is about 825.0727240674. The cubic root of 680745 is about 87.9686958214.

The spelling of 680745 in words is "six hundred eighty thousand, seven hundred forty-five".