678680 has 48 divisors (see below), whose sum is σ = 1645920. Its totient is φ = 251712.

The previous prime is 678659. The next prime is 678719. The reversal of 678680 is 86876.

It is a self number, because there is not a number n which added to its sum of digits gives 678680.

It is a congruent number.

It is an unprimeable number.

678680 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 11 ways as a sum of consecutive naturals, for example, 14417 + ... + 14463.

It is an arithmetic number, because the mean of its divisors is an integer number (34290).

2⁶⁷⁸⁶⁸⁰ 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 678680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (822960).

678680 is an abundant number, since it is smaller than the sum of its proper divisors (967240).

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

678680 is a wasteful number, since it uses less digits than its factorization.

678680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96 (or 73 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 678680 is about 823.8203687698. The cubic root of 678680 is about 87.8796564370.

The spelling of 678680 in words is "six hundred seventy-eight thousand, six hundred eighty".