680440 has 16 divisors (see below), whose sum is σ = 1531080. Its totient is φ = 272160.

The previous prime is 680431. The next prime is 680441. The reversal of 680440 is 44086.

680440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680441) 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, 8466 + ... + 8545.

2⁶⁸⁰⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

680440 is an abundant number, since it is smaller than the sum of its proper divisors (850640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

680440 is a wasteful number, since it uses less digits than its factorization.

680440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17022 (or 17018 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 680440 is about 824.8878711680. The cubic root of 680440 is about 87.9555560700.

The spelling of 680440 in words is "six hundred eighty thousand, four hundred forty".