28663384666 has 24 divisors (see below), whose sum is σ = 50647792320. Its totient is φ = 12128806872.

The previous prime is 28663384657. The next prime is 28663384693. The reversal of 28663384666 is 66648336682.

It is a super-2 number, since 2×28663384666² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28663384666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1843420 + ... + 1858903.

It is an arithmetic number, because the mean of its divisors is an integer number (2110324680).

Almost surely, 2^28663384666 is an apocalyptic number.

28663384666 is a deficient number, since it is larger than the sum of its proper divisors (21984407654).

28663384666 is a wasteful number, since it uses less digits than its factorization.

28663384666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3702418 (or 3702411 counting only the distinct ones).

The product of its digits is 35831808, while the sum is 58.

The spelling of 28663384666 in words is "twenty-eight billion, six hundred sixty-three million, three hundred eighty-four thousand, six hundred sixty-six".