688106 has 4 divisors (see below), whose sum is σ = 1032162. Its totient is φ = 344052.

The previous prime is 688097. The next prime is 688111. The reversal of 688106 is 601886.

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., 429025 + 259081 = 655^2 + 509^2 .

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, 172025 + ... + 172028.

2⁶⁸⁸¹⁰⁶ is an apocalyptic number.

688106 is a deficient number, since it is larger than the sum of its proper divisors (344056).

688106 is a wasteful number, since it uses less digits than its factorization.

688106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344055.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 688106 is about 829.5215488461. The cubic root of 688106 is about 88.2846327808.

The spelling of 688106 in words is "six hundred eighty-eight thousand, one hundred six".