28881784845 has 40 divisors (see below), whose sum is σ = 52977335136. Its totient is φ = 15045385824.

The previous prime is 28881784829. The next prime is 28881784847. The reversal of 28881784845 is 54848718882.

28881784845 is a `hidden beast` number, since 2 + 8 + 8 + 81 + 78 + 484 + 5 = 666.

It is not a de Polignac number, because 28881784845 - 2⁴ = 28881784829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28881784847) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 811807 + ... + 846636.

Almost surely, 2^28881784845 is an apocalyptic number.

It is an amenable number.

28881784845 is a deficient number, since it is larger than the sum of its proper divisors (24095550291).

28881784845 is a wasteful number, since it uses less digits than its factorization.

28881784845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658503 (or 1658494 counting only the distinct ones).

The product of its digits is 36700160, while the sum is 63.

The spelling of 28881784845 in words is "twenty-eight billion, eight hundred eighty-one million, seven hundred eighty-four thousand, eight hundred forty-five".