688871713 has 4 divisors (see below), whose sum is σ = 712625940. Its totient is φ = 665117488.

The previous prime is 688871699. The next prime is 688871731. The reversal of 688871713 is 317178886.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 577104529 + 111767184 = 24023^2 + 10572^2 .

It is a cyclic number.

It is not a de Polignac number, because 688871713 - 2⁵ = 688871681 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688871213) 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 in 3 ways as a sum of consecutive naturals, for example, 11877070 + ... + 11877127.

It is an arithmetic number, because the mean of its divisors is an integer number (178156485).

Almost surely, 2^688871713 is an apocalyptic number.

It is an amenable number.

688871713 is a deficient number, since it is larger than the sum of its proper divisors (23754227).

688871713 is a wasteful number, since it uses less digits than its factorization.

688871713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23754226.

The product of its digits is 451584, while the sum is 49.

The square root of 688871713 is about 26246.3657103226. The cubic root of 688871713 is about 883.1736786888.

The spelling of 688871713 in words is "six hundred eighty-eight million, eight hundred seventy-one thousand, seven hundred thirteen".