6664438 has 12 divisors (see below), whose sum is σ = 10988460. Its totient is φ = 3029180.

The previous prime is 6664429. The next prime is 6664447. The reversal of 6664438 is 8344666.

It is an interprime number because it is at equal distance from previous prime (6664429) and next prime (6664447).

It is a junction number, because it is equal to n+sod(n) for n = 6664397 and 6664406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13528 + ... + 14011.

It is an arithmetic number, because the mean of its divisors is an integer number (915705).

Almost surely, 2^6664438 is an apocalyptic number.

6664438 is a deficient number, since it is larger than the sum of its proper divisors (4324022).

6664438 is a wasteful number, since it uses less digits than its factorization.

6664438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27563 (or 27552 counting only the distinct ones).

The product of its digits is 82944, while the sum is 37.

The square root of 6664438 is about 2581.5572819521. The cubic root of 6664438 is about 188.1862308824.

The spelling of 6664438 in words is "six million, six hundred sixty-four thousand, four hundred thirty-eight".