28321422505 has 4 divisors (see below), whose sum is σ = 33985707012. Its totient is φ = 22657138000.

The previous prime is 28321422469. The next prime is 28321422511. The reversal of 28321422505 is 50522412382.

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 19589641369 + 8731781136 = 139963^2 + 93444^2 .

It is not a de Polignac number, because 28321422505 - 2⁹ = 28321421993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2832142246 + ... + 2832142255.

It is an arithmetic number, because the mean of its divisors is an integer number (8496426753).

Almost surely, 2^28321422505 is an apocalyptic number.

It is an amenable number.

28321422505 is a deficient number, since it is larger than the sum of its proper divisors (5664284507).

28321422505 is an equidigital number, since it uses as much as digits as its factorization.

28321422505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5664284506.

The product of its (nonzero) digits is 38400, while the sum is 34.

Adding to 28321422505 its reverse (50522412382), we get a palindrome (78843834887).

The spelling of 28321422505 in words is "twenty-eight billion, three hundred twenty-one million, four hundred twenty-two thousand, five hundred five".