688346 has 4 divisors (see below), whose sum is σ = 1032522. Its totient is φ = 344172.

The previous prime is 688339. The next prime is 688357. The reversal of 688346 is 643886.

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., 657721 + 30625 = 811^2 + 175^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172085 + ... + 172088.

2⁶⁸⁸³⁴⁶ is an apocalyptic number.

688346 is a deficient number, since it is larger than the sum of its proper divisors (344176).

688346 is a wasteful number, since it uses less digits than its factorization.

688346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344175.

The product of its digits is 27648, while the sum is 35.

The square root of 688346 is about 829.6661979375. Note that the first 3 decimals coincide. The cubic root of 688346 is about 88.2948956613.

The spelling of 688346 in words is "six hundred eighty-eight thousand, three hundred forty-six".