688364399 has 2 divisors, whose sum is σ = 688364400. Its totient is φ = 688364398.

The previous prime is 688364363. The next prime is 688364407. The reversal of 688364399 is 993463886.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 688364399 - 2⁸ = 688364143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688363399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344182199 + 344182200.

It is an arithmetic number, because the mean of its divisors is an integer number (344182200).

Almost surely, 2^688364399 is an apocalyptic number.

688364399 is a deficient number, since it is larger than the sum of its proper divisors (1).

688364399 is an equidigital number, since it uses as much as digits as its factorization.

688364399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6718464, while the sum is 56.

The square root of 688364399 is about 26236.6994684926. The cubic root of 688364399 is about 882.9568234094.

The spelling of 688364399 in words is "six hundred eighty-eight million, three hundred sixty-four thousand, three hundred ninety-nine".