28804358509 has 2 divisors, whose sum is σ = 28804358510. Its totient is φ = 28804358508.

The previous prime is 28804358497. The next prime is 28804358599. The reversal of 28804358509 is 90585340882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28359570409 + 444788100 = 168403^2 + 21090^2 .

It is a cyclic number.

It is not a de Polignac number, because 28804358509 - 2¹¹ = 28804356461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28804358599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14402179254 + 14402179255.

It is an arithmetic number, because the mean of its divisors is an integer number (14402179255).

Almost surely, 2^28804358509 is an apocalyptic number.

It is an amenable number.

28804358509 is a deficient number, since it is larger than the sum of its proper divisors (1).

28804358509 is an equidigital number, since it uses as much as digits as its factorization.

28804358509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2764800, while the sum is 52.

The spelling of 28804358509 in words is "twenty-eight billion, eight hundred four million, three hundred fifty-eight thousand, five hundred nine".