688836 has 24 divisors (see below), whose sum is σ = 1622880. Its totient is φ = 227392.

The previous prime is 688813. The next prime is 688861. The reversal of 688836 is 638886.

It is a junction number, because it is equal to n+sod(n) for n = 688794 and 688803.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 688836.

It is an unprimeable number.

688836 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, 1435 + ... + 1853.

It is an arithmetic number, because the mean of its divisors is an integer number (67620).

2⁶⁸⁸⁸³⁶ is an apocalyptic number.

It is an amenable number.

688836 is an abundant number, since it is smaller than the sum of its proper divisors (934044).

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

688836 is a wasteful number, since it uses less digits than its factorization.

688836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563 (or 561 counting only the distinct ones).

The product of its digits is 55296, while the sum is 39.

The square root of 688836 is about 829.9614448877. The cubic root of 688836 is about 88.3158416376.

The spelling of 688836 in words is "six hundred eighty-eight thousand, eight hundred thirty-six".