688416868 has 6 divisors (see below), whose sum is σ = 1204729526. Its totient is φ = 344208432.

The previous prime is 688416863. The next prime is 688416889. The reversal of 688416868 is 868614886.

It can be written as a sum of positive squares in only one way, i.e., 414448164 + 273968704 = 20358^2 + 16552^2 .

It is not an unprimeable number, because it can be changed into a prime (688416863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86052105 + ... + 86052112.

Almost surely, 2^688416868 is an apocalyptic number.

It is an amenable number.

688416868 is a deficient number, since it is larger than the sum of its proper divisors (516312658).

688416868 is a wasteful number, since it uses less digits than its factorization.

688416868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172104221 (or 172104219 counting only the distinct ones).

The product of its digits is 3538944, while the sum is 55.

The square root of 688416868 is about 26237.6993656075. The cubic root of 688416868 is about 882.9792566268.

The spelling of 688416868 in words is "six hundred eighty-eight million, four hundred sixteen thousand, eight hundred sixty-eight".