688187349 has 12 divisors (see below), whose sum is σ = 994720896. Its totient is φ = 458481192.

The previous prime is 688187341. The next prime is 688187369. The reversal of 688187349 is 943781886.

688187349 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 688187349 - 2³ = 688187341 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 688187295 and 688187304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688187341) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11397 + ... + 38810.

It is an arithmetic number, because the mean of its divisors is an integer number (82893408).

Almost surely, 2^688187349 is an apocalyptic number.

It is an amenable number.

688187349 is a deficient number, since it is larger than the sum of its proper divisors (306533547).

688187349 is a wasteful number, since it uses less digits than its factorization.

688187349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51736 (or 51733 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The square root of 688187349 is about 26233.3251609475. The cubic root of 688187349 is about 882.8811169423.

It can be divided in two parts, 68818 and 7349, that added together give a palindrome (76167).

The spelling of 688187349 in words is "six hundred eighty-eight million, one hundred eighty-seven thousand, three hundred forty-nine".