688858 has 4 divisors (see below), whose sum is σ = 1033290. Its totient is φ = 344428.

The previous prime is 688813. The next prime is 688861. The reversal of 688858 is 858886.

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., 660969 + 27889 = 813^2 + 167^2 .

It is a zygodrome in base 7.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172213 + ... + 172216.

2⁶⁸⁸⁸⁵⁸ is an apocalyptic number.

688858 is a deficient number, since it is larger than the sum of its proper divisors (344432).

688858 is a wasteful number, since it uses less digits than its factorization.

688858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344431.

The product of its digits is 122880, while the sum is 43.

The square root of 688858 is about 829.9746984095. The cubic root of 688858 is about 88.3167818362.

The spelling of 688858 in words is "six hundred eighty-eight thousand, eight hundred fifty-eight".