28805648545 has 16 divisors (see below), whose sum is σ = 35064778320. Its totient is φ = 22714712064.

The previous prime is 28805648519. The next prime is 28805648549. The reversal of 28805648545 is 54584650882.

It can be written as a sum of positive squares in 8 ways, for example, as 301404321 + 28504244224 = 17361^2 + 168832^2 .

It is a cyclic number.

It is not a de Polignac number, because 28805648545 - 2¹¹ = 28805646497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28805648549) 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 15 ways as a sum of consecutive naturals, for example, 31744 + ... + 242113.

It is an arithmetic number, because the mean of its divisors is an integer number (2191548645).

Almost surely, 2^28805648545 is an apocalyptic number.

It is an amenable number.

28805648545 is a deficient number, since it is larger than the sum of its proper divisors (6259129775).

28805648545 is a wasteful number, since it uses less digits than its factorization.

28805648545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274164.

The product of its (nonzero) digits is 12288000, while the sum is 55.

The spelling of 28805648545 in words is "twenty-eight billion, eight hundred five million, six hundred forty-eight thousand, five hundred forty-five".