6644407 has 8 divisors (see below), whose sum is σ = 8284032. Its totient is φ = 5177400.

The previous prime is 6644389. The next prime is 6644413. The reversal of 6644407 is 7044466.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6644407 is a prime.

It is a Duffinian number.

6644407 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6648407) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 43069 + ... + 43222.

It is an arithmetic number, because the mean of its divisors is an integer number (1035504).

Almost surely, 2^6644407 is an apocalyptic number.

6644407 is a deficient number, since it is larger than the sum of its proper divisors (1639625).

6644407 is a wasteful number, since it uses less digits than its factorization.

6644407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86309.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 6644407 is about 2577.6747273463. The cubic root of 6644407 is about 187.9975007213.

The spelling of 6644407 in words is "six million, six hundred forty-four thousand, four hundred seven".