6643449 has 12 divisors (see below), whose sum is σ = 9754212. Its totient is φ = 4356000.

The previous prime is 6643423. The next prime is 6643453. The reversal of 6643449 is 9443466.

6643449 is a `hidden beast` number, since 6 + 643 + 4 + 4 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3861225 + 2782224 = 1965^2 + 1668^2 .

It is not a de Polignac number, because 6643449 - 2⁷ = 6643321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6643489) 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, 5502 + ... + 6599.

It is an arithmetic number, because the mean of its divisors is an integer number (812851).

Almost surely, 2^6643449 is an apocalyptic number.

It is an amenable number.

6643449 is a deficient number, since it is larger than the sum of its proper divisors (3110763).

6643449 is a wasteful number, since it uses less digits than its factorization.

6643449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12168 (or 12165 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 6643449 is about 2577.4888942535. The cubic root of 6643449 is about 187.9884650385.

The spelling of 6643449 in words is "six million, six hundred forty-three thousand, four hundred forty-nine".