687222307 has 2 divisors, whose sum is σ = 687222308. Its totient is φ = 687222306.

The previous prime is 687222299. The next prime is 687222323. The reversal of 687222307 is 703222786.

It is a happy number.

687222307 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 687222307 - 2³ = 687222299 is a prime.

It is not a weakly prime, because it can be changed into another prime (687222397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343611153 + 343611154.

It is an arithmetic number, because the mean of its divisors is an integer number (343611154).

Almost surely, 2^687222307 is an apocalyptic number.

687222307 is a deficient number, since it is larger than the sum of its proper divisors (1).

687222307 is an equidigital number, since it uses as much as digits as its factorization.

687222307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 687222307 is about 26214.9252716844. The cubic root of 687222307 is about 882.4682371596.

The spelling of 687222307 in words is "six hundred eighty-seven million, two hundred twenty-two thousand, three hundred seven".