6444644 has 6 divisors (see below), whose sum is σ = 11278134. Its totient is φ = 3222320.

The previous prime is 6444637. The next prime is 6444653. The reversal of 6444644 is 4464446.

It can be written as a sum of positive squares in only one way, i.e., 3655744 + 2788900 = 1912^2 + 1670^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6444644.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805577 + ... + 805584.

It is an arithmetic number, because the mean of its divisors is an integer number (1879689).

Almost surely, 2^6444644 is an apocalyptic number.

It is an amenable number.

6444644 is a deficient number, since it is larger than the sum of its proper divisors (4833490).

6444644 is a wasteful number, since it uses less digits than its factorization.

6444644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1611165 (or 1611163 counting only the distinct ones).

The product of its digits is 36864, while the sum is 32.

The square root of 6444644 is about 2538.6303393759. The cubic root of 6444644 is about 186.0942598506.

The spelling of 6444644 in words is "six million, four hundred forty-four thousand, six hundred forty-four".