680769 has 6 divisors (see below), whose sum is σ = 983346. Its totient is φ = 453840.

The previous prime is 680767. The next prime is 680783. The reversal of 680769 is 967086.

It can be written as a sum of positive squares in only one way, i.e., 680625 + 144 = 825^2 + 12^2 .

It is not a de Polignac number, because 680769 - 2¹ = 680767 is a prime.

It is a super-2 number, since 2×680769² = 926892862722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (680767) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37812 + ... + 37829.

It is an arithmetic number, because the mean of its divisors is an integer number (163891).

2⁶⁸⁰⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

680769 is a deficient number, since it is larger than the sum of its proper divisors (302577).

680769 is a wasteful number, since it uses less digits than its factorization.

680769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75647 (or 75644 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 680769 is about 825.0872681117. The cubic root of 680769 is about 87.9697296025.

The spelling of 680769 in words is "six hundred eighty thousand, seven hundred sixty-nine".