668424 has 16 divisors (see below), whose sum is σ = 1671120. Its totient is φ = 222800.

The previous prime is 668417. The next prime is 668471. The reversal of 668424 is 424866.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 668391 and 668400.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13902 + ... + 13949.

It is an arithmetic number, because the mean of its divisors is an integer number (104445).

2⁶⁶⁸⁴²⁴ is an apocalyptic number.

It is an amenable number.

668424 is an abundant number, since it is smaller than the sum of its proper divisors (1002696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668424 is a wasteful number, since it uses less digits than its factorization.

668424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27860 (or 27856 counting only the distinct ones).

The product of its digits is 9216, while the sum is 30.

The square root of 668424 is about 817.5720151766. The cubic root of 668424 is about 87.4347377305.

The spelling of 668424 in words is "six hundred sixty-eight thousand, four hundred twenty-four".