688347884 has 144 divisors (see below), whose sum is σ = 1592680320. Its totient is φ = 257886720.

The previous prime is 688347809. The next prime is 688347929. The reversal of 688347884 is 488743886.

688347884 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5254499 + ... + 5254629.

It is an arithmetic number, because the mean of its divisors is an integer number (11060280).

Almost surely, 2^688347884 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 688347884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (796340160).

688347884 is an abundant number, since it is smaller than the sum of its proper divisors (904332436).

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

688347884 is a wasteful number, since it uses less digits than its factorization.

688347884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268 (or 259 counting only the distinct ones).

The product of its digits is 8257536, while the sum is 56.

The square root of 688347884 is about 26236.3847357063. The cubic root of 688347884 is about 882.9497621549.

The spelling of 688347884 in words is "six hundred eighty-eight million, three hundred forty-seven thousand, eight hundred eighty-four".