28980218881 has 2 divisors, whose sum is σ = 28980218882. Its totient is φ = 28980218880.

The previous prime is 28980218851. The next prime is 28980218951. The reversal of 28980218881 is 18881208982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25851494656 + 3128724225 = 160784^2 + 55935^2 .

It is a cyclic number.

It is not a de Polignac number, because 28980218881 - 2²³ = 28971830273 is a prime.

It is a super-2 number, since 2×28980218881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28980218821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14490109440 + 14490109441.

It is an arithmetic number, because the mean of its divisors is an integer number (14490109441).

Almost surely, 2^28980218881 is an apocalyptic number.

It is an amenable number.

28980218881 is a deficient number, since it is larger than the sum of its proper divisors (1).

28980218881 is an equidigital number, since it uses as much as digits as its factorization.

28980218881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1179648, while the sum is 55.

The spelling of 28980218881 in words is "twenty-eight billion, nine hundred eighty million, two hundred eighteen thousand, eight hundred eighty-one".