6444444 has 12 divisors (see below), whose sum is σ = 15037064. Its totient is φ = 2148144.

The previous prime is 6444443. The next prime is 6444481. The reversal of 6444444 is 4444446.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a nude number because it is divisible by every one of its digits.

6444444 is a modest number, since divided by 4444 gives 644 as remainder.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6444443) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 268507 + ... + 268530.

Almost surely, 2^6444444 is an apocalyptic number.

It is an amenable number.

6444444 is an abundant number, since it is smaller than the sum of its proper divisors (8592620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6444444 is a wasteful number, since it uses less digits than its factorization.

6444444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537044 (or 537042 counting only the distinct ones).

The product of its digits is 24576, while the sum is 30.

The square root of 6444444 is about 2538.5909477503. The cubic root of 6444444 is about 186.0923347773.

The spelling of 6444444 in words is "six million, four hundred forty-four thousand, four hundred forty-four".