680784 has 40 divisors (see below), whose sum is σ = 1895712. Its totient is φ = 209280.

The previous prime is 680783. The next prime is 680803. The reversal of 680784 is 487086.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680783) 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, 79 + ... + 1169.

2⁶⁸⁰⁷⁸⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 680784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (947856).

680784 is an abundant number, since it is smaller than the sum of its proper divisors (1214928).

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

680784 is a wasteful number, since it uses less digits than its factorization.

680784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115 (or 1109 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 680784 is about 825.0963580092. The cubic root of 680784 is about 87.9703757033.

The spelling of 680784 in words is "six hundred eighty thousand, seven hundred eighty-four".