680785909 has 4 divisors (see below), whose sum is σ = 685982880. Its totient is φ = 675588940.

The previous prime is 680785907. The next prime is 680785943. The reversal of 680785909 is 909587086.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 680785909 - 2¹ = 680785907 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 (680785907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2598289 + ... + 2598550.

It is an arithmetic number, because the mean of its divisors is an integer number (171495720).

Almost surely, 2^680785909 is an apocalyptic number.

It is an amenable number.

680785909 is a deficient number, since it is larger than the sum of its proper divisors (5196971).

680785909 is a wasteful number, since it uses less digits than its factorization.

680785909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5196970.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The square root of 680785909 is about 26091.8743864829. The cubic root of 680785909 is about 879.7045792975.

The spelling of 680785909 in words is "six hundred eighty million, seven hundred eighty-five thousand, nine hundred nine".