688160393 has 2 divisors, whose sum is σ = 688160394. Its totient is φ = 688160392.

The previous prime is 688160381. The next prime is 688160467. The reversal of 688160393 is 393061886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 676416064 + 11744329 = 26008^2 + 3427^2 .

It is a cyclic number.

It is not a de Polignac number, because 688160393 - 2⁴ = 688160377 is a prime.

It is not a weakly prime, because it can be changed into another prime (688160353) 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, 344080196 + 344080197.

It is an arithmetic number, because the mean of its divisors is an integer number (344080197).

Almost surely, 2^688160393 is an apocalyptic number.

It is an amenable number.

688160393 is a deficient number, since it is larger than the sum of its proper divisors (1).

688160393 is an equidigital number, since it uses as much as digits as its factorization.

688160393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 688160393 is about 26232.8113819316. The cubic root of 688160393 is about 882.8695894350.

The spelling of 688160393 in words is "six hundred eighty-eight million, one hundred sixty thousand, three hundred ninety-three".