680564 has 6 divisors (see below), whose sum is σ = 1190994. Its totient is φ = 340280.

The previous prime is 680539. The next prime is 680567. The reversal of 680564 is 465086.

It can be written as a sum of positive squares in only one way, i.e., 422500 + 258064 = 650^2 + 508^2 .

It is a congruent number.

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

680564 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, 85067 + ... + 85074.

It is an arithmetic number, because the mean of its divisors is an integer number (198499).

2⁶⁸⁰⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

680564 is a deficient number, since it is larger than the sum of its proper divisors (510430).

680564 is a wasteful number, since it uses less digits than its factorization.

680564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170145 (or 170143 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 680564 is about 824.9630294747. The cubic root of 680564 is about 87.9608986065.

It can be divided in two parts, 6 and 80564, that multiplied together give a palindrome (483384).

The spelling of 680564 in words is "six hundred eighty thousand, five hundred sixty-four".