1644448132 has 24 divisors (see below), whose sum is σ = 2983743000. Its totient is φ = 792078336.

The previous prime is 1644448087. The next prime is 1644448133. The reversal of 1644448132 is 2318444461.

It can be written as a sum of positive squares in 4 ways, for example, as 286083396 + 1358364736 = 16914^2 + 36856^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1644448091 and 1644448100.

It is not an unprimeable number, because it can be changed into a prime (1644448133) 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, 36298 + ... + 67870.

It is an arithmetic number, because the mean of its divisors is an integer number (124322625).

Almost surely, 2^1644448132 is an apocalyptic number.

It is an amenable number.

1644448132 is a deficient number, since it is larger than the sum of its proper divisors (1339294868).

1644448132 is a wasteful number, since it uses less digits than its factorization.

1644448132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32055 (or 32053 counting only the distinct ones).

The product of its digits is 73728, while the sum is 37.

The square root of 1644448132 is about 40551.7956692426. The cubic root of 1644448132 is about 1180.3389172985.

The spelling of 1644448132 in words is "one billion, six hundred forty-four million, four hundred forty-eight thousand, one hundred thirty-two".