28233121779 has 10 divisors (see below), whose sum is σ = 42175404260. Its totient is φ = 18822081132.

The previous prime is 28233121751. The next prime is 28233121781. The reversal of 28233121779 is 97712133282.

It is not a de Polignac number, because 28233121779 - 2⁵ = 28233121747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28233121979) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 174278449 + ... + 174278610.

It is an arithmetic number, because the mean of its divisors is an integer number (4217540426).

Almost surely, 2^28233121779 is an apocalyptic number.

28233121779 is a deficient number, since it is larger than the sum of its proper divisors (13942282481).

28233121779 is an equidigital number, since it uses as much as digits as its factorization.

28233121779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348557071 (or 348557062 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The spelling of 28233121779 in words is "twenty-eight billion, two hundred thirty-three million, one hundred twenty-one thousand, seven hundred seventy-nine".