680244509 has 6 divisors (see below), whose sum is σ = 791304894. Its totient is φ = 583066680.

The previous prime is 680244497. The next prime is 680244541. The reversal of 680244509 is 905442086.

680244509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 559464409 + 120780100 = 23653^2 + 10990^2 .

It is a de Polignac number, because none of the positive numbers 2^k-680244509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680244599) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6941222 + ... + 6941319.

It is an arithmetic number, because the mean of its divisors is an integer number (131884149).

Almost surely, 2^680244509 is an apocalyptic number.

It is an amenable number.

680244509 is a deficient number, since it is larger than the sum of its proper divisors (111060385).

680244509 is a wasteful number, since it uses less digits than its factorization.

680244509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13882555 (or 13882548 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 680244509 is about 26081.4974455072. The cubic root of 680244509 is about 879.4713202745.

The spelling of 680244509 in words is "six hundred eighty million, two hundred forty-four thousand, five hundred nine".