28400209009 has 2 divisors, whose sum is σ = 28400209010. Its totient is φ = 28400209008.

The previous prime is 28400209003. The next prime is 28400209063. The reversal of 28400209009 is 90090200482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27259661025 + 1140547984 = 165105^2 + 33772^2 .

It is a cyclic number.

It is not a de Polignac number, because 28400209009 - 2¹³ = 28400200817 is a prime.

It is not a weakly prime, because it can be changed into another prime (28400209003) 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, 14200104504 + 14200104505.

It is an arithmetic number, because the mean of its divisors is an integer number (14200104505).

Almost surely, 2^28400209009 is an apocalyptic number.

It is an amenable number.

28400209009 is a deficient number, since it is larger than the sum of its proper divisors (1).

28400209009 is an equidigital number, since it uses as much as digits as its factorization.

28400209009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The spelling of 28400209009 in words is "twenty-eight billion, four hundred million, two hundred nine thousand, nine".