28005305503 has 8 divisors (see below), whose sum is σ = 32659248800. Its totient is φ = 24004547280.

The previous prime is 28005305501. The next prime is 28005305519. The reversal of 28005305503 is 30550350082.

It is not a de Polignac number, because 28005305503 - 2¹ = 28005305501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28005305501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40823718 + ... + 40824403.

It is an arithmetic number, because the mean of its divisors is an integer number (4082406100).

Almost surely, 2^28005305503 is an apocalyptic number.

28005305503 is a deficient number, since it is larger than the sum of its proper divisors (4653943297).

28005305503 is an frugal number, since it uses more digits than its factorization.

28005305503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81648142 (or 81648128 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 28005305503 its reverse (30550350082), we get a palindrome (58555655585).

The spelling of 28005305503 in words is "twenty-eight billion, five million, three hundred five thousand, five hundred three".