688432 has 20 divisors (see below), whose sum is σ = 1412856. Its totient is φ = 323840.

The previous prime is 688423. The next prime is 688433. The reversal of 688432 is 234886.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 688394 and 688403.

It is not an unprimeable number, because it can be changed into a prime (688433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 994 + ... + 1537.

2⁶⁸⁸⁴³² is an apocalyptic number.

It is an amenable number.

688432 is an abundant number, since it is smaller than the sum of its proper divisors (724424).

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

688432 is a wasteful number, since it uses less digits than its factorization.

688432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2556 (or 2550 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 688432 is about 829.7180243914. The cubic root of 688432 is about 88.2985726129.

The spelling of 688432 in words is "six hundred eighty-eight thousand, four hundred thirty-two".