689728307 has 2 divisors, whose sum is σ = 689728308. Its totient is φ = 689728306.

The previous prime is 689728271. The next prime is 689728327. The reversal of 689728307 is 703827986.

It is a happy number.

689728307 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 689728307 - 2¹⁴ = 689711923 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (689728327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344864153 + 344864154.

It is an arithmetic number, because the mean of its divisors is an integer number (344864154).

Almost surely, 2^689728307 is an apocalyptic number.

689728307 is a deficient number, since it is larger than the sum of its proper divisors (1).

689728307 is an equidigital number, since it uses as much as digits as its factorization.

689728307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The square root of 689728307 is about 26262.6789760679. The cubic root of 689728307 is about 883.5395948697.

The spelling of 689728307 in words is "six hundred eighty-nine million, seven hundred twenty-eight thousand, three hundred seven".