6444220 has 24 divisors (see below), whose sum is σ = 13582800. Its totient is φ = 2568192.

The previous prime is 6444199. The next prime is 6444233. The reversal of 6444220 is 224446.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6444191 and 6444200.

It is a congruent number.

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, 7996 + ... + 8764.

It is an arithmetic number, because the mean of its divisors is an integer number (565950).

Almost surely, 2^6444220 is an apocalyptic number.

It is an amenable number.

6444220 is an abundant number, since it is smaller than the sum of its proper divisors (7138580).

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

6444220 is a wasteful number, since it uses less digits than its factorization.

6444220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197 (or 1195 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 6444220 is about 2538.5468284040. The cubic root of 6444220 is about 186.0901786479.

Adding to 6444220 its reverse (224446), we get a palindrome (6668666).

The spelling of 6444220 in words is "six million, four hundred forty-four thousand, two hundred twenty".