688909860 has 144 divisors (see below), whose sum is σ = 2180068800. Its totient is φ = 182611584.

The previous prime is 688909801. The next prime is 688909889. The reversal of 688909860 is 68909886.

688909860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 688909797 and 688909806.

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, 1112631 + ... + 1113249.

Almost surely, 2^688909860 is an apocalyptic number.

688909860 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 688909860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1090034400).

688909860 is an abundant number, since it is smaller than the sum of its proper divisors (1491158940).

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

688909860 is a wasteful number, since it uses less digits than its factorization.

688909860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872 (or 858 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The square root of 688909860 is about 26247.0924103985. The cubic root of 688909860 is about 883.1899806135.

The spelling of 688909860 in words is "six hundred eighty-eight million, nine hundred nine thousand, eight hundred sixty".