688505 has 8 divisors (see below), whose sum is σ = 862272. Its totient is φ = 526768.

The previous prime is 688477. The next prime is 688511. The reversal of 688505 is 505886.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 688505 - 2⁸ = 688249 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2879 + ... + 3108.

It is an arithmetic number, because the mean of its divisors is an integer number (107784).

2⁶⁸⁸⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

688505 is a deficient number, since it is larger than the sum of its proper divisors (173767).

688505 is a wasteful number, since it uses less digits than its factorization.

688505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6015.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 688505 is about 829.7620140739. The cubic root of 688505 is about 88.3016935060.

The spelling of 688505 in words is "six hundred eighty-eight thousand, five hundred five".