4444644644 has 24 divisors (see below), whose sum is σ = 8492305248. Its totient is φ = 2018608640.

The previous prime is 4444644641. The next prime is 4444644689. The reversal of 4444644644 is 4464464444.

It is a super-2 number, since 2×4444644644² = 39509732022875773472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 4444644595 and 4444644604.

It is not an unprimeable number, because it can be changed into a prime (4444644641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12047 + ... + 95049.

It is an arithmetic number, because the mean of its divisors is an integer number (353846052).

Almost surely, 2^4444644644 is an apocalyptic number.

4444644644 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

4444644644 is a deficient number, since it is larger than the sum of its proper divisors (4047660604).

4444644644 is a wasteful number, since it uses less digits than its factorization.

4444644644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84235 (or 84233 counting only the distinct ones).

The product of its digits is 2359296, while the sum is 44.

The square root of 4444644644 is about 66668.1681464250. The cubic root of 4444644644 is about 1644.1660692444.

The spelling of 4444644644 in words is "four billion, four hundred forty-four million, six hundred forty-four thousand, six hundred forty-four".