688828557 has 4 divisors (see below), whose sum is σ = 918438080. Its totient is φ = 459219036.

The previous prime is 688828513. The next prime is 688828573. The reversal of 688828557 is 755828886.

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 not a de Polignac number, because 688828557 - 2⁷ = 688828429 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 688828497 and 688828506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688808557) 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, 114804757 + ... + 114804762.

It is an arithmetic number, because the mean of its divisors is an integer number (229609520).

Almost surely, 2^688828557 is an apocalyptic number.

It is an amenable number.

688828557 is a deficient number, since it is larger than the sum of its proper divisors (229609523).

688828557 is a wasteful number, since it uses less digits than its factorization.

688828557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229609522.

The product of its digits is 8601600, while the sum is 57.

The square root of 688828557 is about 26245.5435645749. The cubic root of 688828557 is about 883.1552354680.

The spelling of 688828557 in words is "six hundred eighty-eight million, eight hundred twenty-eight thousand, five hundred fifty-seven".