28510011730721 has 2 divisors, whose sum is σ = 28510011730722. Its totient is φ = 28510011730720.

The previous prime is 28510011730709. The next prime is 28510011730751. The reversal of 28510011730721 is 12703711001582.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26538065583121 + 1971946147600 = 5151511^2 + 1404260^2 .

It is a cyclic number.

It is not a de Polignac number, because 28510011730721 - 2¹⁰ = 28510011729697 is a prime.

It is not a weakly prime, because it can be changed into another prime (28510011730751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14255005865360 + 14255005865361.

It is an arithmetic number, because the mean of its divisors is an integer number (14255005865361).

Almost surely, 2^{28510011730721} is an apocalyptic number.

It is an amenable number.

28510011730721 is a deficient number, since it is larger than the sum of its proper divisors (1).

28510011730721 is an equidigital number, since it uses as much as digits as its factorization.

28510011730721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23520, while the sum is 38.

The spelling of 28510011730721 in words is "twenty-eight trillion, five hundred ten billion, eleven million, seven hundred thirty thousand, seven hundred twenty-one".