680340 has 96 divisors (see below), whose sum is σ = 2177280. Its totient is φ = 157696.

The previous prime is 680327. The next prime is 680341. The reversal of 680340 is 43086.

680340 = T₂₄ + T₂₅ + ... + T₁₅₉.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680341) by changing a digit.

680340 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23446 + ... + 23474.

It is an arithmetic number, because the mean of its divisors is an integer number (22680).

2⁶⁸⁰³⁴⁰ is an apocalyptic number.

680340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 680340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1088640).

680340 is an abundant number, since it is smaller than the sum of its proper divisors (1496940).

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

680340 is a wasteful number, since it uses less digits than its factorization.

680340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 680340 is about 824.8272546418. The cubic root of 680340 is about 87.9512471001.

Adding to 680340 its sum of digits (21), we get a triangular number (680361 = T₁₁₆₆).

The spelling of 680340 in words is "six hundred eighty thousand, three hundred forty".