688622 has 16 divisors (see below), whose sum is σ = 1140912. Its totient is φ = 309120.

The previous prime is 688621. The next prime is 688627. The reversal of 688622 is 226886.

It is a happy number.

688622 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 2348 + ... + 2624.

It is an arithmetic number, because the mean of its divisors is an integer number (71307).

2⁶⁸⁸⁶²² is an apocalyptic number.

688622 is a deficient number, since it is larger than the sum of its proper divisors (452290).

688622 is a wasteful number, since it uses less digits than its factorization.

688622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403.

The product of its digits is 9216, while the sum is 32.

The square root of 688622 is about 829.8325132218. The cubic root of 688622 is about 88.3066950252.

The spelling of 688622 in words is "six hundred eighty-eight thousand, six hundred twenty-two".