688626 has 24 divisors (see below), whose sum is σ = 1516944. Its totient is φ = 225720.

The previous prime is 688621. The next prime is 688627. The reversal of 688626 is 626886.

It is not an unprimeable number, because it can be changed into a prime (688621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 921 + ... + 1491.

It is an arithmetic number, because the mean of its divisors is an integer number (63206).

2⁶⁸⁸⁶²⁶ is an apocalyptic number.

688626 is an abundant number, since it is smaller than the sum of its proper divisors (828318).

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

688626 is a wasteful number, since it uses less digits than its factorization.

688626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646 (or 643 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 688626 is about 829.8349233432. The cubic root of 688626 is about 88.3068660073.

The spelling of 688626 in words is "six hundred eighty-eight thousand, six hundred twenty-six".