28944905089 has 2 divisors, whose sum is σ = 28944905090. Its totient is φ = 28944905088.

The previous prime is 28944905081. The next prime is 28944905111. The reversal of 28944905089 is 98050944982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28902720064 + 42185025 = 170008^2 + 6495^2 .

It is a cyclic number.

It is not a de Polignac number, because 28944905089 - 2³ = 28944905081 is a prime.

It is a super-2 number, since 2×28944905089² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28944905081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14472452544 + 14472452545.

It is an arithmetic number, because the mean of its divisors is an integer number (14472452545).

Almost surely, 2^28944905089 is an apocalyptic number.

It is an amenable number.

28944905089 is a deficient number, since it is larger than the sum of its proper divisors (1).

28944905089 is an equidigital number, since it uses as much as digits as its factorization.

28944905089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7464960, while the sum is 58.

The spelling of 28944905089 in words is "twenty-eight billion, nine hundred forty-four million, nine hundred five thousand, eighty-nine".