669143448 has 48 divisors (see below), whose sum is σ = 1874761200. Its totient is φ = 215355840.

The previous prime is 669143441. The next prime is 669143491. The reversal of 669143448 is 844341966.

669143448 is a `hidden beast` number, since 6 + 69 + 143 + 448 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669143441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 158148 + ... + 162323.

It is an arithmetic number, because the mean of its divisors is an integer number (39057525).

Almost surely, 2^669143448 is an apocalyptic number.

It is an amenable number.

669143448 is an abundant number, since it is smaller than the sum of its proper divisors (1205617752).

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

669143448 is a wasteful number, since it uses less digits than its factorization.

669143448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320512 (or 320505 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 669143448 is about 25867.8071741692. The cubic root of 669143448 is about 874.6609616558.

The spelling of 669143448 in words is "six hundred sixty-nine million, one hundred forty-three thousand, four hundred forty-eight".