28427930989 has 2 divisors, whose sum is σ = 28427930990. Its totient is φ = 28427930988.

The previous prime is 28427930987. The next prime is 28427931031. The reversal of 28427930989 is 98903972482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23495678089 + 4932252900 = 153283^2 + 70230^2 .

It is a cyclic number.

It is not a de Polignac number, because 28427930989 - 2¹ = 28427930987 is a prime.

Together with 28427930987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28427930981) 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, 14213965494 + 14213965495.

It is an arithmetic number, because the mean of its divisors is an integer number (14213965495).

Almost surely, 2^28427930989 is an apocalyptic number.

It is an amenable number.

28427930989 is a deficient number, since it is larger than the sum of its proper divisors (1).

28427930989 is an equidigital number, since it uses as much as digits as its factorization.

28427930989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15676416, while the sum is 61.

The spelling of 28427930989 in words is "twenty-eight billion, four hundred twenty-seven million, nine hundred thirty thousand, nine hundred eighty-nine".