688478 has 8 divisors (see below), whose sum is σ = 1180272. Its totient is φ = 295056.

The previous prime is 688477. The next prime is 688511. The reversal of 688478 is 874886.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24575 + ... + 24602.

It is an arithmetic number, because the mean of its divisors is an integer number (147534).

2⁶⁸⁸⁴⁷⁸ is an apocalyptic number.

688478 is a deficient number, since it is larger than the sum of its proper divisors (491794).

688478 is a wasteful number, since it uses less digits than its factorization.

688478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49186.

The product of its digits is 86016, while the sum is 41.

The square root of 688478 is about 829.7457441891. The cubic root of 688478 is about 88.3005392288.

The spelling of 688478 in words is "six hundred eighty-eight thousand, four hundred seventy-eight".