28267421785 has 4 divisors (see below), whose sum is σ = 33920906148. Its totient is φ = 22613937424.

The previous prime is 28267421783. The next prime is 28267421813. The reversal of 28267421785 is 58712476282.

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 4503349449 + 23764072336 = 67107^2 + 154156^2 .

It is a cyclic number.

It is not a de Polignac number, because 28267421785 - 2¹ = 28267421783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28267421783) 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, 2826742174 + ... + 2826742183.

It is an arithmetic number, because the mean of its divisors is an integer number (8480226537).

Almost surely, 2^28267421785 is an apocalyptic number.

It is an amenable number.

28267421785 is a deficient number, since it is larger than the sum of its proper divisors (5653484363).

28267421785 is an equidigital number, since it uses as much as digits as its factorization.

28267421785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5653484362.

The product of its digits is 3010560, while the sum is 52.

The spelling of 28267421785 in words is "twenty-eight billion, two hundred sixty-seven million, four hundred twenty-one thousand, seven hundred eighty-five".