28971378539 has 2 divisors, whose sum is σ = 28971378540. Its totient is φ = 28971378538.

The previous prime is 28971378521. The next prime is 28971378551. The reversal of 28971378539 is 93587317982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28971378539 - 2⁸ = 28971378283 is a prime.

It is not a weakly prime, because it can be changed into another prime (28971378559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14485689269 + 14485689270.

It is an arithmetic number, because the mean of its divisors is an integer number (14485689270).

Almost surely, 2^28971378539 is an apocalyptic number.

28971378539 is a deficient number, since it is larger than the sum of its proper divisors (1).

28971378539 is an equidigital number, since it uses as much as digits as its factorization.

28971378539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22861440, while the sum is 62.

The spelling of 28971378539 in words is "twenty-eight billion, nine hundred seventy-one million, three hundred seventy-eight thousand, five hundred thirty-nine".