28211384881 has 2 divisors, whose sum is σ = 28211384882. Its totient is φ = 28211384880.

The previous prime is 28211384869. The next prime is 28211384899. The reversal of 28211384881 is 18848311282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25421432481 + 2789952400 = 159441^2 + 52820^2 .

It is a cyclic number.

It is not a de Polignac number, because 28211384881 - 2¹⁷ = 28211253809 is a prime.

It is a super-2 number, since 2×28211384881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28211384081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14105692440 + 14105692441.

It is an arithmetic number, because the mean of its divisors is an integer number (14105692441).

Almost surely, 2^28211384881 is an apocalyptic number.

It is an amenable number.

28211384881 is a deficient number, since it is larger than the sum of its proper divisors (1).

28211384881 is an equidigital number, since it uses as much as digits as its factorization.

28211384881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 196608, while the sum is 46.

The spelling of 28211384881 in words is "twenty-eight billion, two hundred eleven million, three hundred eighty-four thousand, eight hundred eighty-one".