669424 has 40 divisors (see below), whose sum is σ = 1527680. Its totient is φ = 278208.

The previous prime is 669419. The next prime is 669433. The reversal of 669424 is 424966.

669424 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4747 + ... + 4885.

It is an arithmetic number, because the mean of its divisors is an integer number (38192).

2⁶⁶⁹⁴²⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (763840).

669424 is an abundant number, since it is smaller than the sum of its proper divisors (858256).

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

669424 is a wasteful number, since it uses less digits than its factorization.

669424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 191 counting only the distinct ones).

The product of its digits is 10368, while the sum is 31.

The square root of 669424 is about 818.1833535339. The cubic root of 669424 is about 87.4783184375.

The spelling of 669424 in words is "six hundred sixty-nine thousand, four hundred twenty-four".