669444480 has 256 divisors, whose sum is σ = 2496960000. Its totient is φ = 169039872.

The previous prime is 669444467. The next prime is 669444481. The reversal of 669444480 is 84444966.

669444480 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669444481) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 327301 + ... + 329339.

It is an arithmetic number, because the mean of its divisors is an integer number (9753750).

Almost surely, 2^669444480 is an apocalyptic number.

669444480 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669444480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1248480000).

669444480 is an abundant number, since it is smaller than the sum of its proper divisors (1827515520).

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

669444480 is a wasteful number, since it uses less digits than its factorization.

669444480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2086 (or 2068 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 45.

The square root of 669444480 is about 25873.6251808671. The cubic root of 669444480 is about 874.7921051672.

The spelling of 669444480 in words is "six hundred sixty-nine million, four hundred forty-four thousand, four hundred eighty".