28001128501 has 2 divisors, whose sum is σ = 28001128502. Its totient is φ = 28001128500.

The previous prime is 28001128489. The next prime is 28001128549. The reversal of 28001128501 is 10582110082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25834132900 + 2166995601 = 160730^2 + 46551^2 .

It is a cyclic number.

It is not a de Polignac number, because 28001128501 - 2¹¹ = 28001126453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28001128501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28001168501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14000564250 + 14000564251.

It is an arithmetic number, because the mean of its divisors is an integer number (14000564251).

Almost surely, 2^28001128501 is an apocalyptic number.

It is an amenable number.

28001128501 is a deficient number, since it is larger than the sum of its proper divisors (1).

28001128501 is an equidigital number, since it uses as much as digits as its factorization.

28001128501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 28.

Adding to 28001128501 its reverse (10582110082), we get a palindrome (38583238583).

The spelling of 28001128501 in words is "twenty-eight billion, one million, one hundred twenty-eight thousand, five hundred one".