688400299 has 2 divisors, whose sum is σ = 688400300. Its totient is φ = 688400298.

The previous prime is 688400269. The next prime is 688400333. The reversal of 688400299 is 992004886.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 688400299 - 2¹⁵ = 688367531 is a prime.

It is not a weakly prime, because it can be changed into another prime (688400239) 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, 344200149 + 344200150.

It is an arithmetic number, because the mean of its divisors is an integer number (344200150).

Almost surely, 2^688400299 is an apocalyptic number.

688400299 is a deficient number, since it is larger than the sum of its proper divisors (1).

688400299 is an equidigital number, since it uses as much as digits as its factorization.

688400299 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 688400299 is about 26237.3836157495. The cubic root of 688400299 is about 882.9721726435.

The spelling of 688400299 in words is "six hundred eighty-eight million, four hundred thousand, two hundred ninety-nine".