688244 has 12 divisors (see below), whose sum is σ = 1221444. Its totient is φ = 339264.

The previous prime is 688223. The next prime is 688249. The reversal of 688244 is 442886.

It can be written as a sum of positive squares in 2 ways, for example, as 250000 + 438244 = 500^2 + 662^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 688244.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 688244.

It is not an unprimeable number, because it can be changed into a prime (688249) by changing a digit.

688244 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 3 ways as a sum of consecutive naturals, for example, 887 + ... + 1470.

It is an arithmetic number, because the mean of its divisors is an integer number (101787).

2⁶⁸⁸²⁴⁴ is an apocalyptic number.

It is an amenable number.

688244 is a deficient number, since it is larger than the sum of its proper divisors (533200).

688244 is a wasteful number, since it uses less digits than its factorization.

688244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2434 (or 2432 counting only the distinct ones).

The product of its digits is 12288, while the sum is 32.

The square root of 688244 is about 829.6047251553. The cubic root of 688244 is about 88.2905342286.

The spelling of 688244 in words is "six hundred eighty-eight thousand, two hundred forty-four".