6644001 has 16 divisors (see below), whose sum is σ = 10903424. Its totient is φ = 3504384.

The previous prime is 6643999. The next prime is 6644023. The reversal of 6644001 is 1004466.

It is not a de Polignac number, because 6644001 - 2¹ = 6643999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (6644081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11896 + ... + 12441.

It is an arithmetic number, because the mean of its divisors is an integer number (681464).

Almost surely, 2^6644001 is an apocalyptic number.

It is an amenable number.

6644001 is a deficient number, since it is larger than the sum of its proper divisors (4259423).

6644001 is a wasteful number, since it uses less digits than its factorization.

6644001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24360.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 6644001 is about 2577.5959729950. The cubic root of 6644001 is about 187.9936715087.

Adding to 6644001 its reverse (1004466), we get a palindrome (7648467).

The spelling of 6644001 in words is "six million, six hundred forty-four thousand, one".