6666448 has 20 divisors (see below), whose sum is σ = 13676580. Its totient is φ = 3137024.

The previous prime is 6666437. The next prime is 6666449. The reversal of 6666448 is 8446666.

It can be written as a sum of positive squares in 2 ways, for example, as 5721664 + 944784 = 2392^2 + 972^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6666448.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11983 + ... + 12526.

It is an arithmetic number, because the mean of its divisors is an integer number (683829).

Almost surely, 2^6666448 is an apocalyptic number.

6666448 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

6666448 is an abundant number, since it is smaller than the sum of its proper divisors (7010132).

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

6666448 is a wasteful number, since it uses less digits than its factorization.

6666448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24534 (or 24528 counting only the distinct ones).

The product of its digits is 165888, while the sum is 40.

The square root of 6666448 is about 2581.9465525065. The cubic root of 6666448 is about 188.2051480216.

The spelling of 6666448 in words is "six million, six hundred sixty-six thousand, four hundred forty-eight".