678688 has 24 divisors (see below), whose sum is σ = 1354752. Its totient is φ = 334656.

The previous prime is 678659. The next prime is 678719. The reversal of 678688 is 886876.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3981 + ... + 4147.

It is an arithmetic number, because the mean of its divisors is an integer number (56448).

2⁶⁷⁸⁶⁸⁸ is an apocalyptic number.

It is an amenable number.

678688 is a deficient number, since it is larger than the sum of its proper divisors (676064).

678688 is a wasteful number, since it uses less digits than its factorization.

678688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 296 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 678688 is about 823.8252241829. The cubic root of 678688 is about 87.8800017320.

It can be divided in two parts, 67868 and 8, that added together give a palindrome (67876).

The spelling of 678688 in words is "six hundred seventy-eight thousand, six hundred eighty-eight".