688679699 has 2 divisors, whose sum is σ = 688679700. Its totient is φ = 688679698.

The previous prime is 688679689. The next prime is 688679867. The reversal of 688679699 is 996976886.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 688679699 - 2²⁰ = 687631123 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (688679609) 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, 344339849 + 344339850.

It is an arithmetic number, because the mean of its divisors is an integer number (344339850).

Almost surely, 2^688679699 is an apocalyptic number.

688679699 is a deficient number, since it is larger than the sum of its proper divisors (1).

688679699 is an equidigital number, since it uses as much as digits as its factorization.

688679699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70543872, while the sum is 68.

The square root of 688679699 is about 26242.7075394289. The cubic root of 688679699 is about 883.0916133510.

The spelling of 688679699 in words is "six hundred eighty-eight million, six hundred seventy-nine thousand, six hundred ninety-nine".