28226889121 has 4 divisors (see below), whose sum is σ = 28231287472. Its totient is φ = 28222490772.

The previous prime is 28226889109. The next prime is 28226889139. The reversal of 28226889121 is 12198862282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28226889121 - 2¹⁵ = 28226856353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28226889181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2189535 + ... + 2202388.

It is an arithmetic number, because the mean of its divisors is an integer number (7057821868).

Almost surely, 2^28226889121 is an apocalyptic number.

It is an amenable number.

28226889121 is a deficient number, since it is larger than the sum of its proper divisors (4398351).

28226889121 is an equidigital number, since it uses as much as digits as its factorization.

28226889121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4398350.

The product of its digits is 442368, while the sum is 49.

The spelling of 28226889121 in words is "twenty-eight billion, two hundred twenty-six million, eight hundred eighty-nine thousand, one hundred twenty-one".