688709560 has 128 divisors (see below), whose sum is σ = 1968883200. Its totient is φ = 210562560.

The previous prime is 688709551. The next prime is 688709561. The reversal of 688709560 is 65907886.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688709561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 161131 + ... + 165349.

It is an arithmetic number, because the mean of its divisors is an integer number (15381900).

Almost surely, 2^688709560 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 688709560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (984441600).

688709560 is an abundant number, since it is smaller than the sum of its proper divisors (1280173640).

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

688709560 is a wasteful number, since it uses less digits than its factorization.

688709560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4301 (or 4297 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 49.

The square root of 688709560 is about 26243.2764722700. The cubic root of 688709560 is about 883.1043767192.

The spelling of 688709560 in words is "six hundred eighty-eight million, seven hundred nine thousand, five hundred sixty".