688154868 has 36 divisors (see below), whose sum is σ = 1740981060. Its totient is φ = 229190016.

The previous prime is 688154839. The next prime is 688154893. The reversal of 688154868 is 868451886.

It can be written as a sum of positive squares in 2 ways, for example, as 152324964 + 535829904 = 12342^2 + 23148^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38488 + ... + 53456.

It is an arithmetic number, because the mean of its divisors is an integer number (48360585).

Almost surely, 2^688154868 is an apocalyptic number.

It is an amenable number.

688154868 is an abundant number, since it is smaller than the sum of its proper divisors (1052826192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

688154868 is a wasteful number, since it uses less digits than its factorization.

688154868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16256 (or 16251 counting only the distinct ones).

The product of its digits is 2949120, while the sum is 54.

The square root of 688154868 is about 26232.7060746695. The cubic root of 688154868 is about 882.8672266779.

The spelling of 688154868 in words is "six hundred eighty-eight million, one hundred fifty-four thousand, eight hundred sixty-eight".