1643741768 has 16 divisors (see below), whose sum is σ = 3181436160. Its totient is φ = 795358800.

The previous prime is 1643741741. The next prime is 1643741777. The reversal of 1643741768 is 8671473461.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3313748 + ... + 3314243.

It is an arithmetic number, because the mean of its divisors is an integer number (198839760).

Almost surely, 2^1643741768 is an apocalyptic number.

It is an amenable number.

1643741768 is a deficient number, since it is larger than the sum of its proper divisors (1537694392).

1643741768 is a wasteful number, since it uses less digits than its factorization.

1643741768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6628028 (or 6628024 counting only the distinct ones).

The product of its digits is 677376, while the sum is 47.

The square root of 1643741768 is about 40543.0853290669. The cubic root of 1643741768 is about 1180.1698903143.

The spelling of 1643741768 in words is "one billion, six hundred forty-three million, seven hundred forty-one thousand, seven hundred sixty-eight".