28158823811 has 4 divisors (see below), whose sum is σ = 28164710952. Its totient is φ = 28152936672.

The previous prime is 28158823789. The next prime is 28158823813. The reversal of 28158823811 is 11832885182.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28158823811 - 2¹⁴ = 28158807427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28158823813) 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, 2936390 + ... + 2945963.

It is an arithmetic number, because the mean of its divisors is an integer number (7041177738).

Almost surely, 2^28158823811 is an apocalyptic number.

28158823811 is a deficient number, since it is larger than the sum of its proper divisors (5887141).

28158823811 is an equidigital number, since it uses as much as digits as its factorization.

28158823811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5887140.

The product of its digits is 245760, while the sum is 47.

The spelling of 28158823811 in words is "twenty-eight billion, one hundred fifty-eight million, eight hundred twenty-three thousand, eight hundred eleven".