28409642291 has 2 divisors, whose sum is σ = 28409642292. Its totient is φ = 28409642290.

The previous prime is 28409642203. The next prime is 28409642309. The reversal of 28409642291 is 19224690482.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28409642291 - 2¹⁸ = 28409380147 is a prime.

It is not a weakly prime, because it can be changed into another prime (28409642791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14204821145 + 14204821146.

It is an arithmetic number, because the mean of its divisors is an integer number (14204821146).

Almost surely, 2^28409642291 is an apocalyptic number.

28409642291 is a deficient number, since it is larger than the sum of its proper divisors (1).

28409642291 is an equidigital number, since it uses as much as digits as its factorization.

28409642291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 497664, while the sum is 47.

The spelling of 28409642291 in words is "twenty-eight billion, four hundred nine million, six hundred forty-two thousand, two hundred ninety-one".