688614673 has 2 divisors, whose sum is σ = 688614674. Its totient is φ = 688614672.

The previous prime is 688614649. The next prime is 688614683. The reversal of 688614673 is 376416886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 345327889 + 343286784 = 18583^2 + 18528^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688614673 is a prime.

It is not a weakly prime, because it can be changed into another prime (688614613) 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, 344307336 + 344307337.

It is an arithmetic number, because the mean of its divisors is an integer number (344307337).

Almost surely, 2^688614673 is an apocalyptic number.

It is an amenable number.

688614673 is a deficient number, since it is larger than the sum of its proper divisors (1).

688614673 is an equidigital number, since it uses as much as digits as its factorization.

688614673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 49.

The square root of 688614673 is about 26241.4685755199. The cubic root of 688614673 is about 883.0638182707.

The spelling of 688614673 in words is "six hundred eighty-eight million, six hundred fourteen thousand, six hundred seventy-three".