28445240881 has 2 divisors, whose sum is σ = 28445240882. Its totient is φ = 28445240880.

The previous prime is 28445240849. The next prime is 28445240897. The reversal of 28445240881 is 18804254482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28425960000 + 19280881 = 168600^2 + 4391^2 .

It is a cyclic number.

It is not a de Polignac number, because 28445240881 - 2⁵ = 28445240849 is a prime.

It is a super-2 number, since 2×28445240881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28445240281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14222620440 + 14222620441.

It is an arithmetic number, because the mean of its divisors is an integer number (14222620441).

Almost surely, 2^28445240881 is an apocalyptic number.

It is an amenable number.

28445240881 is a deficient number, since it is larger than the sum of its proper divisors (1).

28445240881 is an equidigital number, since it uses as much as digits as its factorization.

28445240881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 655360, while the sum is 46.

The spelling of 28445240881 in words is "twenty-eight billion, four hundred forty-five million, two hundred forty thousand, eight hundred eighty-one".