28443018249 has 12 divisors (see below), whose sum is σ = 41094406912. Its totient is φ = 18957375000.

The previous prime is 28443018239. The next prime is 28443018269. The reversal of 28443018249 is 94281034482.

28443018249 is a `hidden beast` number, since 28 + 443 + 0 + 182 + 4 + 9 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-28443018249 is a prime.

It is a super-2 number, since 2×28443018249² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28443018239) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 347377 + ... + 421374.

Almost surely, 2^28443018249 is an apocalyptic number.

It is an amenable number.

28443018249 is a deficient number, since it is larger than the sum of its proper divisors (12651388663).

28443018249 is a wasteful number, since it uses less digits than its factorization.

28443018249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772868 (or 772865 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The spelling of 28443018249 in words is "twenty-eight billion, four hundred forty-three million, eighteen thousand, two hundred forty-nine".