688692 has 24 divisors (see below), whose sum is σ = 1663200. Its totient is φ = 221536.

The previous prime is 688679. The next prime is 688697. The reversal of 688692 is 296886.

It is a self number, because there is not a number n which added to its sum of digits gives 688692.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688697) by changing a digit.

688692 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 642 + ... + 1337.

It is an arithmetic number, because the mean of its divisors is an integer number (69300).

2⁶⁸⁸⁶⁹² is an apocalyptic number.

It is an amenable number.

688692 is an abundant number, since it is smaller than the sum of its proper divisors (974508).

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

688692 is a wasteful number, since it uses less digits than its factorization.

688692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2015 (or 2013 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 688692 is about 829.8746893357. The cubic root of 688692 is about 88.3096871163.

The spelling of 688692 in words is "six hundred eighty-eight thousand, six hundred ninety-two".