28027561311909 has 8 divisors (see below), whose sum is σ = 41522313054720. Its totient is φ = 18685040874588.

The previous prime is 28027561311881. The next prime is 28027561311913. The reversal of 28027561311909 is 90911316572082.

It is a happy number.

28027561311909 is a `hidden beast` number, since 2 + 8 + 0 + 2 + 7 + 5 + 613 + 1 + 19 + 0 + 9 = 666.

It is not a de Polignac number, because 28027561311909 - 2³¹ = 28025413828261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28027561311979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519028913157 + ... + 519028913210.

It is an arithmetic number, because the mean of its divisors is an integer number (5190289131840).

Almost surely, 2^{28027561311909} is an apocalyptic number.

It is an amenable number.

28027561311909 is a deficient number, since it is larger than the sum of its proper divisors (13494751742811).

28027561311909 is a wasteful number, since it uses less digits than its factorization.

28027561311909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038057826376 (or 1038057826370 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The spelling of 28027561311909 in words is "twenty-eight trillion, twenty-seven billion, five hundred sixty-one million, three hundred eleven thousand, nine hundred nine".