680440207 has 4 divisors (see below), whose sum is σ = 681321240. Its totient is φ = 679559176.

The previous prime is 680440169. The next prime is 680440231. The reversal of 680440207 is 702044086.

680440207 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-680440207 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 (680440247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439357 + ... + 440902.

It is an arithmetic number, because the mean of its divisors is an integer number (170330310).

Almost surely, 2^680440207 is an apocalyptic number.

680440207 is a deficient number, since it is larger than the sum of its proper divisors (881033).

680440207 is an equidigital number, since it uses as much as digits as its factorization.

680440207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881032.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 680440207 is about 26085.2488391428. The cubic root of 680440207 is about 879.5556498914. Note that the first 3 decimals are identical.

The spelling of 680440207 in words is "six hundred eighty million, four hundred forty thousand, two hundred seven".