688238 has 8 divisors (see below), whose sum is σ = 1038288. Its totient is φ = 342144.

The previous prime is 688223. The next prime is 688249. The reversal of 688238 is 832886.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 688198 and 688207.

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 688238.

It is an unprimeable number.

688238 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 506 + ... + 1277.

It is an arithmetic number, because the mean of its divisors is an integer number (129786).

2⁶⁸⁸²³⁸ is an apocalyptic number.

688238 is a deficient number, since it is larger than the sum of its proper divisors (350050).

688238 is a wasteful number, since it uses less digits than its factorization.

688238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978.

The product of its digits is 18432, while the sum is 35.

The square root of 688238 is about 829.6011089674. The cubic root of 688238 is about 88.2902776603.

The spelling of 688238 in words is "six hundred eighty-eight thousand, two hundred thirty-eight".