28539448991 has 2 divisors, whose sum is σ = 28539448992. Its totient is φ = 28539448990.

The previous prime is 28539448943. The next prime is 28539449021. The reversal of 28539448991 is 19984493582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28539448991 - 2¹⁸ = 28539186847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28539408991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14269724495 + 14269724496.

It is an arithmetic number, because the mean of its divisors is an integer number (14269724496).

Almost surely, 2^28539448991 is an apocalyptic number.

28539448991 is a deficient number, since it is larger than the sum of its proper divisors (1).

28539448991 is an equidigital number, since it uses as much as digits as its factorization.

28539448991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22394880, while the sum is 62.

The spelling of 28539448991 in words is "twenty-eight billion, five hundred thirty-nine million, four hundred forty-eight thousand, nine hundred ninety-one".