28557742391 has 2 divisors, whose sum is σ = 28557742392. Its totient is φ = 28557742390.

The previous prime is 28557742363. The next prime is 28557742393. The reversal of 28557742391 is 19324775582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28557742391 - 2⁶ = 28557742327 is a prime.

Together with 28557742393, 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 (28557742393) 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, 14278871195 + 14278871196.

It is an arithmetic number, because the mean of its divisors is an integer number (14278871196).

Almost surely, 2^28557742391 is an apocalyptic number.

28557742391 is a deficient number, since it is larger than the sum of its proper divisors (1).

28557742391 is an equidigital number, since it uses as much as digits as its factorization.

28557742391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4233600, while the sum is 53.

The spelling of 28557742391 in words is "twenty-eight billion, five hundred fifty-seven million, seven hundred forty-two thousand, three hundred ninety-one".