688606 has 8 divisors (see below), whose sum is σ = 1040760. Its totient is φ = 341688.

The previous prime is 688591. The next prime is 688621. The reversal of 688606 is 606886.

It is a happy number.

688606 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (688591) and next prime (688621).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 961 + ... + 1516.

It is an arithmetic number, because the mean of its divisors is an integer number (130095).

2⁶⁸⁸⁶⁰⁶ is an apocalyptic number.

688606 is a deficient number, since it is larger than the sum of its proper divisors (352154).

688606 is a wasteful number, since it uses less digits than its factorization.

688606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2618.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 688606 is about 829.8228726662. The cubic root of 688606 is about 88.3060110902.

The spelling of 688606 in words is "six hundred eighty-eight thousand, six hundred six".