680844657 has 16 divisors (see below), whose sum is σ = 918025920. Its totient is φ = 448806912.

The previous prime is 680844617. The next prime is 680844707. The reversal of 680844657 is 756448086.

680844657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 680844657 - 2¹² = 680840561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (680844617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103993 + ... + 110345.

It is an arithmetic number, because the mean of its divisors is an integer number (57376620).

Almost surely, 2^680844657 is an apocalyptic number.

It is an amenable number.

680844657 is a deficient number, since it is larger than the sum of its proper divisors (237181263).

680844657 is a wasteful number, since it uses less digits than its factorization.

680844657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6752.

The product of its (nonzero) digits is 1290240, while the sum is 48.

The square root of 680844657 is about 26093.0001532978. Note that the first 3 decimals coincide. The cubic root of 680844657 is about 879.7298830910.

The spelling of 680844657 in words is "six hundred eighty million, eight hundred forty-four thousand, six hundred fifty-seven".