669944 has 32 divisors (see below), whose sum is σ = 1434240. Its totient is φ = 290400.

The previous prime is 669943. The next prime is 669947. The reversal of 669944 is 449966.

669944 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 669898 and 669907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1859 + ... + 2189.

It is an arithmetic number, because the mean of its divisors is an integer number (44820).

2⁶⁶⁹⁹⁴⁴ 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 669944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (717120).

669944 is an abundant number, since it is smaller than the sum of its proper divisors (764296).

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

669944 is a wasteful number, since it uses less digits than its factorization.

669944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371 (or 367 counting only the distinct ones).

The product of its digits is 46656, while the sum is 38.

The square root of 669944 is about 818.5010690280. The cubic root of 669944 is about 87.5009632547.

The spelling of 669944 in words is "six hundred sixty-nine thousand, nine hundred forty-four".