28412636881 has 2 divisors, whose sum is σ = 28412636882. Its totient is φ = 28412636880.

The previous prime is 28412636831. The next prime is 28412636887. The reversal of 28412636881 is 18863621482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21591363600 + 6821273281 = 146940^2 + 82591^2 .

It is a cyclic number.

It is not a de Polignac number, because 28412636881 - 2⁷ = 28412636753 is a prime.

It is a super-2 number, since 2×28412636881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28412636887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14206318440 + 14206318441.

It is an arithmetic number, because the mean of its divisors is an integer number (14206318441).

Almost surely, 2^28412636881 is an apocalyptic number.

It is an amenable number.

28412636881 is a deficient number, since it is larger than the sum of its proper divisors (1).

28412636881 is an equidigital number, since it uses as much as digits as its factorization.

28412636881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 884736, while the sum is 49.

The spelling of 28412636881 in words is "twenty-eight billion, four hundred twelve million, six hundred thirty-six thousand, eight hundred eighty-one".