680740 has 24 divisors (see below), whose sum is σ = 1447992. Its totient is φ = 268800.

The previous prime is 680707. The next prime is 680749. The reversal of 680740 is 47086.

It can be written as a sum of positive squares in 4 ways, for example, as 153664 + 527076 = 392^2 + 726^2 .

680740 is a modest number, since divided by 740 gives 680 as remainder.

It is a zygodrome in base 7.

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 7 ways as a sum of consecutive naturals, for example, 1852 + ... + 2188.

It is an arithmetic number, because the mean of its divisors is an integer number (60333).

2⁶⁸⁰⁷⁴⁰ is an apocalyptic number.

It is an amenable number.

680740 is an abundant number, since it is smaller than the sum of its proper divisors (767252).

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

680740 is a wasteful number, since it uses less digits than its factorization.

680740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447 (or 445 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 680740 is about 825.0696940259. The cubic root of 680740 is about 87.9684804473.

The spelling of 680740 in words is "six hundred eighty thousand, seven hundred forty".