6444624442 has 16 divisors (see below), whose sum is σ = 9939291264. Its totient is φ = 3132108000.

The previous prime is 6444624413. The next prime is 6444624451. The reversal of 6444624442 is 2444264446.

It is a happy number.

It is a super-2 number, since 2×6444624442² = 83066368396847622728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6444624395 and 6444624404.

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, 122784 + ... + 167227.

It is an arithmetic number, because the mean of its divisors is an integer number (621205704).

Almost surely, 2^6444624442 is an apocalyptic number.

6444624442 is a deficient number, since it is larger than the sum of its proper divisors (3494666822).

6444624442 is a wasteful number, since it uses less digits than its factorization.

6444624442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290325.

The product of its digits is 589824, while the sum is 40.

The square root of 6444624442 is about 80278.4182828735. The cubic root of 6444624442 is about 1860.9407159947.

Adding to 6444624442 its reverse (2444264446), we get a palindrome (8888888888).

It can be divided in two parts, 64446 and 24442, that added together give a palindrome (88888).

The spelling of 6444624442 in words is "six billion, four hundred forty-four million, six hundred twenty-four thousand, four hundred forty-two".