28449681287 has 2 divisors, whose sum is σ = 28449681288. Its totient is φ = 28449681286.

The previous prime is 28449681269. The next prime is 28449681289. The reversal of 28449681287 is 78218694482.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28449681287 - 2⁶ = 28449681223 is a prime.

Together with 28449681289, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28449681289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14224840643 + 14224840644.

It is an arithmetic number, because the mean of its divisors is an integer number (14224840644).

Almost surely, 2^28449681287 is an apocalyptic number.

28449681287 is a deficient number, since it is larger than the sum of its proper divisors (1).

28449681287 is an equidigital number, since it uses as much as digits as its factorization.

28449681287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12386304, while the sum is 59.

The spelling of 28449681287 in words is "twenty-eight billion, four hundred forty-nine million, six hundred eighty-one thousand, two hundred eighty-seven".