688706928 has 160 divisors (see below), whose sum is σ = 2433177600. Its totient is φ = 181626624.

The previous prime is 688706867. The next prime is 688706947. The reversal of 688706928 is 829607886.

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

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 30553 + ... + 48071.

It is an arithmetic number, because the mean of its divisors is an integer number (15207360).

Almost surely, 2^688706928 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 688706928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1216588800).

688706928 is an abundant number, since it is smaller than the sum of its proper divisors (1744470672).

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

688706928 is a wasteful number, since it uses less digits than its factorization.

688706928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17556 (or 17544 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The square root of 688706928 is about 26243.2263260446. The cubic root of 688706928 is about 883.1032517487.

The spelling of 688706928 in words is "six hundred eighty-eight million, seven hundred six thousand, nine hundred twenty-eight".