680408909 has 8 divisors (see below), whose sum is σ = 705048960. Its totient is φ = 656169696.

The previous prime is 680408881. The next prime is 680408917. The reversal of 680408909 is 909804086.

680408909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 680408909 - 2²⁴ = 663631693 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 680408909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680408809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96752 + ... + 103545.

It is an arithmetic number, because the mean of its divisors is an integer number (88131120).

Almost surely, 2^680408909 is an apocalyptic number.

It is an amenable number.

680408909 is a deficient number, since it is larger than the sum of its proper divisors (24640051).

680408909 is a wasteful number, since it uses less digits than its factorization.

680408909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200419.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 680408909 is about 26084.6489146394. The cubic root of 680408909 is about 879.5421641339.

The spelling of 680408909 in words is "six hundred eighty million, four hundred eight thousand, nine hundred nine".