680678 has 4 divisors (see below), whose sum is σ = 1021020. Its totient is φ = 340338.

The previous prime is 680657. The next prime is 680681. The reversal of 680678 is 876086.

680678 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

680678 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 as a sum of consecutive naturals, namely, 170168 + ... + 170171.

It is an arithmetic number, because the mean of its divisors is an integer number (255255).

2⁶⁸⁰⁶⁷⁸ is an apocalyptic number.

680678 is a deficient number, since it is larger than the sum of its proper divisors (340342).

680678 is a wasteful number, since it uses less digits than its factorization.

680678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340341.

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

The square root of 680678 is about 825.0321205868. The cubic root of 680678 is about 87.9658097207.

The spelling of 680678 in words is "six hundred eighty thousand, six hundred seventy-eight".