688231 has 6 divisors (see below), whose sum is σ = 715232. Its totient is φ = 661560.

The previous prime is 688223. The next prime is 688249. The reversal of 688231 is 132886.

It is not a de Polignac number, because 688231 - 2³ = 688223 is a prime.

It is a super-2 number, since 2×688231² = 947323818722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 688231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4545 + ... + 4693.

2⁶⁸⁸²³¹ is an apocalyptic number.

688231 is a deficient number, since it is larger than the sum of its proper divisors (27001).

688231 is an equidigital number, since it uses as much as digits as its factorization.

688231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329 (or 180 counting only the distinct ones).

The product of its digits is 2304, while the sum is 28.

The square root of 688231 is about 829.5968900617. The cubic root of 688231 is about 88.2899783288.

It can be divided in two parts, 688 and 231, that added together give a palindrome (919).

The spelling of 688231 in words is "six hundred eighty-eight thousand, two hundred thirty-one".