28001128549 has 2 divisors, whose sum is σ = 28001128550. Its totient is φ = 28001128548.

The previous prime is 28001128501. The next prime is 28001128567. The reversal of 28001128549 is 94582110082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14407200900 + 13593927649 = 120030^2 + 116593^2 .

It is a cyclic number.

It is not a de Polignac number, because 28001128549 - 2¹⁷ = 28000997477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28001128249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14000564274 + 14000564275.

It is an arithmetic number, because the mean of its divisors is an integer number (14000564275).

Almost surely, 2^28001128549 is an apocalyptic number.

It is an amenable number.

28001128549 is a deficient number, since it is larger than the sum of its proper divisors (1).

28001128549 is an equidigital number, since it uses as much as digits as its factorization.

28001128549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 40.

The spelling of 28001128549 in words is "twenty-eight billion, one million, one hundred twenty-eight thousand, five hundred forty-nine".