688834 has 4 divisors (see below), whose sum is σ = 1033254. Its totient is φ = 344416.

The previous prime is 688813. The next prime is 688861. The reversal of 688834 is 438886.

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., 600625 + 88209 = 775^2 + 297^2 .

It is a junction number, because it is equal to n+sod(n) for n = 688793 and 688802.

It is a congruent number.

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, 172207 + ... + 172210.

2⁶⁸⁸⁸³⁴ is an apocalyptic number.

688834 is a deficient number, since it is larger than the sum of its proper divisors (344420).

688834 is a wasteful number, since it uses less digits than its factorization.

688834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344419.

The product of its digits is 36864, while the sum is 37.

The square root of 688834 is about 829.9602400115. The cubic root of 688834 is about 88.3157561640.

The spelling of 688834 in words is "six hundred eighty-eight thousand, eight hundred thirty-four".