644214441 has 16 divisors (see below), whose sum is σ = 954867200. Its totient is φ = 383650560.

The previous prime is 644214391. The next prime is 644214443. The reversal of 644214441 is 144412446.

It is not a de Polignac number, because 644214441 - 2¹³ = 644206249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 644214399 and 644214408.

It is not an unprimeable number, because it can be changed into a prime (644214443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265216 + ... + 267633.

It is an arithmetic number, because the mean of its divisors is an integer number (59679200).

Almost surely, 2^644214441 is an apocalyptic number.

It is an amenable number.

644214441 is a deficient number, since it is larger than the sum of its proper divisors (310652759).

644214441 is a wasteful number, since it uses less digits than its factorization.

644214441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532896.

The product of its digits is 12288, while the sum is 30.

The square root of 644214441 is about 25381.3798088284. The cubic root of 644214441 is about 863.6613510679.

Adding to 644214441 its reverse (144412446), we get a palindrome (788626887).

The spelling of 644214441 in words is "six hundred forty-four million, two hundred fourteen thousand, four hundred forty-one".