678424 has 16 divisors (see below), whose sum is σ = 1283400. Its totient is φ = 336192.

The previous prime is 678421. The next prime is 678437. The reversal of 678424 is 424876.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678421) 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, 787 + ... + 1405.

2⁶⁷⁸⁴²⁴ is an apocalyptic number.

It is an amenable number.

678424 is a deficient number, since it is larger than the sum of its proper divisors (604976).

678424 is a wasteful number, since it uses less digits than its factorization.

678424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762 (or 758 counting only the distinct ones).

The product of its digits is 10752, while the sum is 31.

The square root of 678424 is about 823.6649804380. The cubic root of 678424 is about 87.8686055631.

The spelling of 678424 in words is "six hundred seventy-eight thousand, four hundred twenty-four".