668432 has 10 divisors (see below), whose sum is σ = 1295118. Its totient is φ = 334208.

The previous prime is 668417. The next prime is 668471. The reversal of 668432 is 234866.

It can be written as a sum of positive squares in only one way, i.e., 541696 + 126736 = 736^2 + 356^2 .

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 668395 and 668404.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 668432.

It is an unprimeable number.

668432 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 as a sum of consecutive naturals, namely, 20873 + ... + 20904.

2⁶⁶⁸⁴³² is an apocalyptic number.

It is an amenable number.

668432 is a deficient number, since it is larger than the sum of its proper divisors (626686).

668432 is a wasteful number, since it uses less digits than its factorization.

668432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41785 (or 41779 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 668432 is about 817.5769076974. The cubic root of 668432 is about 87.4350865486.

The spelling of 668432 in words is "six hundred sixty-eight thousand, four hundred thirty-two".