688238743 has 4 divisors (see below), whose sum is σ = 688913848. Its totient is φ = 687563640.

The previous prime is 688238699. The next prime is 688238773. The reversal of 688238743 is 347832886.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688238743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688238773) 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, 336021 + ... + 338062.

It is an arithmetic number, because the mean of its divisors is an integer number (172228462).

Almost surely, 2^688238743 is an apocalyptic number.

688238743 is a deficient number, since it is larger than the sum of its proper divisors (675105).

688238743 is a wasteful number, since it uses less digits than its factorization.

688238743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675104.

The product of its digits is 1548288, while the sum is 49.

The square root of 688238743 is about 26234.3046982381. The cubic root of 688238743 is about 882.9030943213.

The spelling of 688238743 in words is "six hundred eighty-eight million, two hundred thirty-eight thousand, seven hundred forty-three".