688707907 has 2 divisors, whose sum is σ = 688707908. Its totient is φ = 688707906.

The previous prime is 688707871. The next prime is 688707911. The reversal of 688707907 is 709707886.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688707907 is a prime.

It is not a weakly prime, because it can be changed into another prime (688707007) 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 as a sum of consecutive naturals, namely, 344353953 + 344353954.

It is an arithmetic number, because the mean of its divisors is an integer number (344353954).

Almost surely, 2^688707907 is an apocalyptic number.

688707907 is a deficient number, since it is larger than the sum of its proper divisors (1).

688707907 is an equidigital number, since it uses as much as digits as its factorization.

688707907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1185408, while the sum is 52.

The square root of 688707907 is about 26243.2449784702. The cubic root of 688707907 is about 883.1036701936.

The spelling of 688707907 in words is "six hundred eighty-eight million, seven hundred seven thousand, nine hundred seven".