28643323568 has 20 divisors (see below), whose sum is σ = 56850012408. Its totient is φ = 13972352640.

The previous prime is 28643323543. The next prime is 28643323573. The reversal of 28643323568 is 86532334682.

It is a super-2 number, since 2×28643323568² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21831146 + ... + 21832457.

Almost surely, 2^28643323568 is an apocalyptic number.

It is an amenable number.

28643323568 is a deficient number, since it is larger than the sum of its proper divisors (28206688840).

28643323568 is a wasteful number, since it uses less digits than its factorization.

28643323568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43663652 (or 43663646 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 50.

The spelling of 28643323568 in words is "twenty-eight billion, six hundred forty-three million, three hundred twenty-three thousand, five hundred sixty-eight".