28121260393 has 2 divisors, whose sum is σ = 28121260394. Its totient is φ = 28121260392.

The previous prime is 28121260267. The next prime is 28121260411. The reversal of 28121260393 is 39306212182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25963843689 + 2157416704 = 161133^2 + 46448^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28121260393 is a prime.

It is not a weakly prime, because it can be changed into another prime (28121260693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14060630196 + 14060630197.

It is an arithmetic number, because the mean of its divisors is an integer number (14060630197).

Almost surely, 2^28121260393 is an apocalyptic number.

It is an amenable number.

28121260393 is a deficient number, since it is larger than the sum of its proper divisors (1).

28121260393 is an equidigital number, since it uses as much as digits as its factorization.

28121260393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 28121260393 in words is "twenty-eight billion, one hundred twenty-one million, two hundred sixty thousand, three hundred ninety-three".