28447406809 has 2 divisors, whose sum is σ = 28447406810. Its totient is φ = 28447406808.

The previous prime is 28447406777. The next prime is 28447406833. The reversal of 28447406809 is 90860474482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24537656025 + 3909750784 = 156645^2 + 62528^2 .

It is a cyclic number.

It is not a de Polignac number, because 28447406809 - 2⁵ = 28447406777 is a prime.

It is not a weakly prime, because it can be changed into another prime (28447406839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14223703404 + 14223703405.

It is an arithmetic number, because the mean of its divisors is an integer number (14223703405).

Almost surely, 2^28447406809 is an apocalyptic number.

It is an amenable number.

28447406809 is a deficient number, since it is larger than the sum of its proper divisors (1).

28447406809 is an equidigital number, since it uses as much as digits as its factorization.

28447406809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3096576, while the sum is 52.

The spelling of 28447406809 in words is "twenty-eight billion, four hundred forty-seven million, four hundred six thousand, eight hundred nine".