28027561311905 has 16 divisors (see below), whose sum is σ = 34796681298000. Its totient is φ = 21646481525760.

The previous prime is 28027561311881. The next prime is 28027561311913. The reversal of 28027561311905 is 50911316572082.

It can be written as a sum of positive squares in 8 ways, for example, as 5980939795216 + 22046621516689 = 2445596^2 + 4695383^2 .

It is not a de Polignac number, because 28027561311905 - 2²⁸ = 28027292876449 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9368276 + ... + 11992485.

It is an arithmetic number, because the mean of its divisors is an integer number (2174792581125).

Almost surely, 2^{28027561311905} is an apocalyptic number.

It is an amenable number.

28027561311905 is a deficient number, since it is larger than the sum of its proper divisors (6769119986095).

28027561311905 is a wasteful number, since it uses less digits than its factorization.

28027561311905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21369844.

The product of its (nonzero) digits is 907200, while the sum is 50.

Adding to 28027561311905 its reverse (50911316572082), we get a palindrome (78938877883987).

The spelling of 28027561311905 in words is "twenty-eight trillion, twenty-seven billion, five hundred sixty-one million, three hundred eleven thousand, nine hundred five".