28646266409 has 2 divisors, whose sum is σ = 28646266410. Its totient is φ = 28646266408.

The previous prime is 28646266399. The next prime is 28646266417. The reversal of 28646266409 is 90466264682.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22093849600 + 6552416809 = 148640^2 + 80947^2 .

It is a cyclic number.

It is not a de Polignac number, because 28646266409 - 2²⁴ = 28629489193 is a prime.

It is not a weakly prime, because it can be changed into another prime (28646266309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14323133204 + 14323133205.

It is an arithmetic number, because the mean of its divisors is an integer number (14323133205).

Almost surely, 2^28646266409 is an apocalyptic number.

It is an amenable number.

28646266409 is a deficient number, since it is larger than the sum of its proper divisors (1).

28646266409 is an equidigital number, since it uses as much as digits as its factorization.

28646266409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5971968, while the sum is 53.

The spelling of 28646266409 in words is "twenty-eight billion, six hundred forty-six million, two hundred sixty-six thousand, four hundred nine".