669444048 has 160 divisors (see below), whose sum is σ = 2365126400. Its totient is φ = 176546304.

The previous prime is 669444047. The next prime is 669444067. The reversal of 669444048 is 840444966.

669444048 is nontrivially palindromic in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 669443994 and 669444012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669444047) 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, 30798 + ... + 47826.

It is an arithmetic number, because the mean of its divisors is an integer number (14782040).

Almost surely, 2^669444048 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 669444048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1182563200).

669444048 is an abundant number, since it is smaller than the sum of its proper divisors (1695682352).

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

669444048 is a wasteful number, since it uses less digits than its factorization.

669444048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17066 (or 17054 counting only the distinct ones).

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

The square root of 669444048 is about 25873.6168325961. The cubic root of 669444048 is about 874.7919169961.

The spelling of 669444048 in words is "six hundred sixty-nine million, four hundred forty-four thousand, forty-eight".