688927117 has 4 divisors (see below), whose sum is σ = 689076640. Its totient is φ = 688777596.

The previous prime is 688927051. The next prime is 688927133. The reversal of 688927117 is 711729886.

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 a de Polignac number, because none of the positive numbers 2^k-688927117 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 (688927817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67623 + ... + 77140.

It is an arithmetic number, because the mean of its divisors is an integer number (172269160).

Almost surely, 2^688927117 is an apocalyptic number.

It is an amenable number.

688927117 is a deficient number, since it is larger than the sum of its proper divisors (149523).

688927117 is a wasteful number, since it uses less digits than its factorization.

688927117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149522.

The product of its digits is 338688, while the sum is 49.

The square root of 688927117 is about 26247.4211495149. The cubic root of 688927117 is about 883.1973551063.

The spelling of 688927117 in words is "six hundred eighty-eight million, nine hundred twenty-seven thousand, one hundred seventeen".