28189837253 has 4 divisors (see below), whose sum is σ = 28190175840. Its totient is φ = 28189498668.

The previous prime is 28189837243. The next prime is 28189837271. The reversal of 28189837253 is 35273898182.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28189837253 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 (28189837243) 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, 52118 + ... + 243096.

It is an arithmetic number, because the mean of its divisors is an integer number (7047543960).

Almost surely, 2^28189837253 is an apocalyptic number.

It is an amenable number.

28189837253 is a deficient number, since it is larger than the sum of its proper divisors (338587).

28189837253 is a wasteful number, since it uses less digits than its factorization.

28189837253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338586.

The product of its digits is 5806080, while the sum is 56.

The spelling of 28189837253 in words is "twenty-eight billion, one hundred eighty-nine million, eight hundred thirty-seven thousand, two hundred fifty-three".