688731113 has 24 divisors (see below), whose sum is σ = 838693440. Its totient is φ = 562863840.

The previous prime is 688731103. The next prime is 688731119. The reversal of 688731113 is 311137886.

688731113 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 688731113 - 2⁴ = 688731097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688731119) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 437618 + ... + 439188.

It is an arithmetic number, because the mean of its divisors is an integer number (34945560).

Almost surely, 2^688731113 is an apocalyptic number.

It is an amenable number.

688731113 is a deficient number, since it is larger than the sum of its proper divisors (149962327).

688731113 is a wasteful number, since it uses less digits than its factorization.

688731113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997 (or 1990 counting only the distinct ones).

The product of its digits is 24192, while the sum is 38.

The square root of 688731113 is about 26243.6871075693. The cubic root of 688731113 is about 883.1135888027.

Adding to 688731113 its reverse (311137886), we get a palindrome (999868999).

The spelling of 688731113 in words is "six hundred eighty-eight million, seven hundred thirty-one thousand, one hundred thirteen".