688512 has 64 divisors (see below), whose sum is σ = 2007360. Its totient is φ = 207360.

The previous prime is 688511. The next prime is 688531. The reversal of 688512 is 215886.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 688512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4143 + ... + 4305.

It is an arithmetic number, because the mean of its divisors is an integer number (31365).

2⁶⁸⁸⁵¹² 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 688512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1003680).

688512 is an abundant number, since it is smaller than the sum of its proper divisors (1318848).

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

688512 is a wasteful number, since it uses less digits than its factorization.

688512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191 (or 179 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 688512 is about 829.7662321401. The cubic root of 688512 is about 88.3019927581.

The spelling of 688512 in words is "six hundred eighty-eight thousand, five hundred twelve".