28110611509 has 4 divisors (see below), whose sum is σ = 28870357804. Its totient is φ = 27350865216.

The previous prime is 28110611497. The next prime is 28110611513. The reversal of 28110611509 is 90511601182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25821276100 + 2289335409 = 160690^2 + 47847^2 .

It is a cyclic number.

It is not a de Polignac number, because 28110611509 - 2¹⁹ = 28110087221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28110611519) 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 3 ways as a sum of consecutive naturals, for example, 379873092 + ... + 379873165.

It is an arithmetic number, because the mean of its divisors is an integer number (7217589451).

Almost surely, 2^28110611509 is an apocalyptic number.

It is an amenable number.

28110611509 is a deficient number, since it is larger than the sum of its proper divisors (759746295).

28110611509 is an equidigital number, since it uses as much as digits as its factorization.

28110611509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759746294.

The product of its (nonzero) digits is 4320, while the sum is 34.

The spelling of 28110611509 in words is "twenty-eight billion, one hundred ten million, six hundred eleven thousand, five hundred nine".