1643463882 has 24 divisors (see below), whose sum is σ = 3770300196. Its totient is φ = 515596416.

The previous prime is 1643463863. The next prime is 1643463937. The reversal of 1643463882 is 2883643461.

1643463882 is a `hidden beast` number, since 1 + 6 + 4 + 3 + 4 + 638 + 8 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1643410521 + 53361 = 40539^2 + 231^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2685093 + ... + 2685704.

Almost surely, 2^1643463882 is an apocalyptic number.

1643463882 is an abundant number, since it is smaller than the sum of its proper divisors (2126836314).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1643463882 is a wasteful number, since it uses less digits than its factorization.

1643463882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5370822 (or 5370819 counting only the distinct ones).

The product of its digits is 663552, while the sum is 45.

The square root of 1643463882 is about 40539.6581386671. The cubic root of 1643463882 is about 1180.1033812517.

The spelling of 1643463882 in words is "one billion, six hundred forty-three million, four hundred sixty-three thousand, eight hundred eighty-two".