688234 has 4 divisors (see below), whose sum is σ = 1032354. Its totient is φ = 344116.

The previous prime is 688223. The next prime is 688249. The reversal of 688234 is 432886.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 483025 + 205209 = 695^2 + 453^2 .

It is a junction number, because it is equal to n+sod(n) for n = 688196 and 688205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172057 + ... + 172060.

2⁶⁸⁸²³⁴ is an apocalyptic number.

688234 is a deficient number, since it is larger than the sum of its proper divisors (344120).

688234 is a wasteful number, since it uses less digits than its factorization.

688234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344119.

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

The square root of 688234 is about 829.5986981668. The cubic root of 688234 is about 88.2901066140.

The spelling of 688234 in words is "six hundred eighty-eight thousand, two hundred thirty-four".