688164189 has 4 divisors (see below), whose sum is σ = 917552256. Its totient is φ = 458776124.

The previous prime is 688164179. The next prime is 688164227. The reversal of 688164189 is 981461886.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 688164189 - 2⁵ = 688164157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688164179) 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, 114694029 + ... + 114694034.

It is an arithmetic number, because the mean of its divisors is an integer number (229388064).

Almost surely, 2^688164189 is an apocalyptic number.

It is an amenable number.

688164189 is a deficient number, since it is larger than the sum of its proper divisors (229388067).

688164189 is a wasteful number, since it uses less digits than its factorization.

688164189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229388066.

The product of its digits is 663552, while the sum is 51.

The square root of 688164189 is about 26232.8837339702. The cubic root of 688164189 is about 882.8712127807.

The spelling of 688164189 in words is "six hundred eighty-eight million, one hundred sixty-four thousand, one hundred eighty-nine".