28027561311881 has 2 divisors, whose sum is σ = 28027561311882. Its totient is φ = 28027561311880.

The previous prime is 28027561311859. The next prime is 28027561311913. The reversal of 28027561311881 is 18811316572082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24747550545481 + 3280010766400 = 4974691^2 + 1811080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28027561311881 is a prime.

It is a super-2 number, since 2×28027561311881² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28027561311811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14013780655940 + 14013780655941.

It is an arithmetic number, because the mean of its divisors is an integer number (14013780655941).

Almost surely, 2^{28027561311881} is an apocalyptic number.

It is an amenable number.

28027561311881 is a deficient number, since it is larger than the sum of its proper divisors (1).

28027561311881 is an equidigital number, since it uses as much as digits as its factorization.

28027561311881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1290240, while the sum is 53.

The spelling of 28027561311881 in words is "twenty-eight trillion, twenty-seven billion, five hundred sixty-one million, three hundred eleven thousand, eight hundred eighty-one".