680445 has 12 divisors (see below), whose sum is σ = 1179516. Its totient is φ = 362880.

The previous prime is 680443. The next prime is 680453. The reversal of 680445 is 544086.

It can be written as a sum of positive squares in 2 ways, for example, as 191844 + 488601 = 438^2 + 699^2 .

It is not a de Polignac number, because 680445 - 2¹ = 680443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7516 + ... + 7605.

It is an arithmetic number, because the mean of its divisors is an integer number (98293).

2⁶⁸⁰⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

680445 is a deficient number, since it is larger than the sum of its proper divisors (499071).

680445 is a wasteful number, since it uses less digits than its factorization.

680445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15132 (or 15129 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 680445 is about 824.8909018773. The cubic root of 680445 is about 87.9557715074.

The spelling of 680445 in words is "six hundred eighty thousand, four hundred forty-five".