28778884441 has 4 divisors (see below), whose sum is σ = 29707235584. Its totient is φ = 27850533300.

The previous prime is 28778884429. The next prime is 28778884447. The reversal of 28778884441 is 14448887782.

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 not a de Polignac number, because 28778884441 - 2¹⁷ = 28778753369 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28778884441.

It is not an unprimeable number, because it can be changed into a prime (28778884447) 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, 464175525 + ... + 464175586.

It is an arithmetic number, because the mean of its divisors is an integer number (7426808896).

Almost surely, 2^28778884441 is an apocalyptic number.

It is an amenable number.

28778884441 is a deficient number, since it is larger than the sum of its proper divisors (928351143).

28778884441 is an equidigital number, since it uses as much as digits as its factorization.

28778884441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928351142.

The product of its digits is 25690112, while the sum is 61.

The spelling of 28778884441 in words is "twenty-eight billion, seven hundred seventy-eight million, eight hundred eighty-four thousand, four hundred forty-one".