669989446 has 60 divisors (see below), whose sum is σ = 1216182996. Its totient is φ = 276759840.

The previous prime is 669989357. The next prime is 669989447. The reversal of 669989446 is 644989966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669989447) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 8072121 + ... + 8072203.

Almost surely, 2^669989446 is an apocalyptic number.

669989446 is a deficient number, since it is larger than the sum of its proper divisors (546193550).

669989446 is an frugal number, since it uses more digits than its factorization.

669989446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 133 counting only the distinct ones).

The product of its digits is 20155392, while the sum is 61.

The square root of 669989446 is about 25884.1543419908. The cubic root of 669989446 is about 875.0294176776.

The spelling of 669989446 in words is "six hundred sixty-nine million, nine hundred eighty-nine thousand, four hundred forty-six".