680566 has 4 divisors (see below), whose sum is σ = 1020852. Its totient is φ = 340282.

The previous prime is 680539. The next prime is 680567. The reversal of 680566 is 665086.

680566 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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (680567) by changing a digit.

680566 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, 170140 + ... + 170143.

It is an arithmetic number, because the mean of its divisors is an integer number (255213).

2⁶⁸⁰⁵⁶⁶ is an apocalyptic number.

680566 is a deficient number, since it is larger than the sum of its proper divisors (340286).

680566 is a wasteful number, since it uses less digits than its factorization.

680566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340285.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 680566 is about 824.9642416493. The cubic root of 680566 is about 87.9609847711.

The spelling of 680566 in words is "six hundred eighty thousand, five hundred sixty-six".