28557742439 has 2 divisors, whose sum is σ = 28557742440. Its totient is φ = 28557742438.

The previous prime is 28557742393. The next prime is 28557742441. The reversal of 28557742439 is 93424775582.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28557742439 is a prime.

Together with 28557742441, 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 (28557742139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14278871219 + 14278871220.

It is an arithmetic number, because the mean of its divisors is an integer number (14278871220).

Almost surely, 2^28557742439 is an apocalyptic number.

28557742439 is a deficient number, since it is larger than the sum of its proper divisors (1).

28557742439 is an equidigital number, since it uses as much as digits as its factorization.

28557742439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16934400, while the sum is 56.

The spelling of 28557742439 in words is "twenty-eight billion, five hundred fifty-seven million, seven hundred forty-two thousand, four hundred thirty-nine".