1645244008 has 24 divisors (see below), whose sum is σ = 3192404850. Its totient is φ = 793957472.

The previous prime is 1645243987. The next prime is 1645244039. The reversal of 1645244008 is 8004425461.

It can be written as a sum of positive squares in only one way, i.e., 1389947524 + 255296484 = 37282^2 + 15978^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 616485 + ... + 619147.

Almost surely, 2^1645244008 is an apocalyptic number.

It is an amenable number.

1645244008 is a deficient number, since it is larger than the sum of its proper divisors (1547160842).

1645244008 is an frugal number, since it uses more digits than its factorization.

1645244008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5361 (or 2694 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 34.

The square root of 1645244008 is about 40561.6075618312. The cubic root of 1645244008 is about 1180.5293057716.

Adding to 1645244008 its reverse (8004425461), we get a palindrome (9649669469).

The spelling of 1645244008 in words is "one billion, six hundred forty-five million, two hundred forty-four thousand, eight".