1644545332 has 6 divisors (see below), whose sum is σ = 2877954338. Its totient is φ = 822272664.

The previous prime is 1644545281. The next prime is 1644545339. The reversal of 1644545332 is 2335454461.

It can be written as a sum of positive squares in only one way, i.e., 1228222116 + 416323216 = 35046^2 + 20404^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1644545291 and 1644545300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644545339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205568163 + ... + 205568170.

Almost surely, 2^1644545332 is an apocalyptic number.

It is an amenable number.

1644545332 is a deficient number, since it is larger than the sum of its proper divisors (1233409006).

1644545332 is a wasteful number, since it uses less digits than its factorization.

1644545332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411136337 (or 411136335 counting only the distinct ones).

The product of its digits is 172800, while the sum is 37.

The square root of 1644545332 is about 40552.9941188071. The cubic root of 1644545332 is about 1180.3621726549.

Adding to 1644545332 its reverse (2335454461), we get a palindrome (3979999793).

The spelling of 1644545332 in words is "one billion, six hundred forty-four million, five hundred forty-five thousand, three hundred thirty-two".