28140749447 has 2 divisors, whose sum is σ = 28140749448. Its totient is φ = 28140749446.

The previous prime is 28140749369. The next prime is 28140749449. The reversal of 28140749447 is 74494704182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28140749447 - 2⁸ = 28140749191 is a prime.

Together with 28140749449, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28140749395 and 28140749404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28140749449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14070374723 + 14070374724.

It is an arithmetic number, because the mean of its divisors is an integer number (14070374724).

Almost surely, 2^28140749447 is an apocalyptic number.

28140749447 is a deficient number, since it is larger than the sum of its proper divisors (1).

28140749447 is an equidigital number, since it uses as much as digits as its factorization.

28140749447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1806336, while the sum is 50.

The spelling of 28140749447 in words is "twenty-eight billion, one hundred forty million, seven hundred forty-nine thousand, four hundred forty-seven".