680103721 has 16 divisors (see below), whose sum is σ = 781073280. Its totient is φ = 586136320.

The previous prime is 680103713. The next prime is 680103731. The reversal of 680103721 is 127301086.

It is not a de Polignac number, because 680103721 - 2³ = 680103713 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 680103721.

It is not an unprimeable number, because it can be changed into a prime (680103731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16695 + ... + 40483.

It is an arithmetic number, because the mean of its divisors is an integer number (48817080).

Almost surely, 2^680103721 is an apocalyptic number.

It is an amenable number.

680103721 is a deficient number, since it is larger than the sum of its proper divisors (100969559).

680103721 is a wasteful number, since it uses less digits than its factorization.

680103721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23936.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 680103721 is about 26078.7983043698. The cubic root of 680103721 is about 879.4106423126.

It can be divided in two parts, 680 and 103721, that added together give a palindrome (104401).

The spelling of 680103721 in words is "six hundred eighty million, one hundred three thousand, seven hundred twenty-one".