688858399 has 2 divisors, whose sum is σ = 688858400. Its totient is φ = 688858398.

The previous prime is 688858363. The next prime is 688858427. The reversal of 688858399 is 993858886.

688858399 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 688858399 - 2²¹ = 686761247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 688858399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688858799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344429199 + 344429200.

It is an arithmetic number, because the mean of its divisors is an integer number (344429200).

Almost surely, 2^688858399 is an apocalyptic number.

688858399 is a deficient number, since it is larger than the sum of its proper divisors (1).

688858399 is an equidigital number, since it uses as much as digits as its factorization.

688858399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29859840, while the sum is 64.

The square root of 688858399 is about 26246.1120739815. The cubic root of 688858399 is about 883.1679888775.

It can be divided in two parts, 68885 and 8399, that added together give a square (77284 = 278²).

The spelling of 688858399 in words is "six hundred eighty-eight million, eight hundred fifty-eight thousand, three hundred ninety-nine".