688937713 has 4 divisors (see below), whose sum is σ = 689203188. Its totient is φ = 688672240.

The previous prime is 688937687. The next prime is 688937723. The reversal of 688937713 is 317739886.

It is a happy number.

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 207705744 + 481231969 = 14412^2 + 21937^2 .

It is a cyclic number.

It is not a de Polignac number, because 688937713 - 2²⁹ = 152066801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688937723) 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, 128806 + ... + 134047.

It is an arithmetic number, because the mean of its divisors is an integer number (172300797).

Almost surely, 2^688937713 is an apocalyptic number.

It is an amenable number.

688937713 is a deficient number, since it is larger than the sum of its proper divisors (265475).

688937713 is a wasteful number, since it uses less digits than its factorization.

688937713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265474.

The product of its digits is 1524096, while the sum is 52.

The square root of 688937713 is about 26247.6229971401. The cubic root of 688937713 is about 883.2018830701.

The spelling of 688937713 in words is "six hundred eighty-eight million, nine hundred thirty-seven thousand, seven hundred thirteen".