6644945 has 8 divisors (see below), whose sum is σ = 7988544. Its totient is φ = 5306224.

The previous prime is 6644933. The next prime is 6644959. The reversal of 6644945 is 5494466.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6644945 - 2¹² = 6640849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6644899 and 6644908.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3332 + ... + 4938.

It is an arithmetic number, because the mean of its divisors is an integer number (998568).

Almost surely, 2^6644945 is an apocalyptic number.

It is an amenable number.

6644945 is a deficient number, since it is larger than the sum of its proper divisors (1343599).

6644945 is a wasteful number, since it uses less digits than its factorization.

6644945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2439.

The product of its digits is 103680, while the sum is 38.

The square root of 6644945 is about 2577.7790828541. The cubic root of 6644945 is about 188.0025746592.

The spelling of 6644945 in words is "six million, six hundred forty-four thousand, nine hundred forty-five".