28621717099 has 2 divisors, whose sum is σ = 28621717100. Its totient is φ = 28621717098.

The previous prime is 28621717057. The next prime is 28621717207. The reversal of 28621717099 is 99071712682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28621717099 - 2⁹ = 28621716587 is a prime.

It is not a weakly prime, because it can be changed into another prime (28621717039) 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, 14310858549 + 14310858550.

It is an arithmetic number, because the mean of its divisors is an integer number (14310858550).

Almost surely, 2^28621717099 is an apocalyptic number.

28621717099 is a deficient number, since it is larger than the sum of its proper divisors (1).

28621717099 is an equidigital number, since it uses as much as digits as its factorization.

28621717099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 762048, while the sum is 52.

The spelling of 28621717099 in words is "twenty-eight billion, six hundred twenty-one million, seven hundred seventeen thousand, ninety-nine".