28557742393 has 2 divisors, whose sum is σ = 28557742394. Its totient is φ = 28557742392.

The previous prime is 28557742391. The next prime is 28557742439. The reversal of 28557742393 is 39324775582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28543088809 + 14653584 = 168947^2 + 3828^2 .

It is a cyclic number.

It is not a de Polignac number, because 28557742393 - 2¹ = 28557742391 is a prime.

Together with 28557742391, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28557742391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14278871196 + 14278871197.

It is an arithmetic number, because the mean of its divisors is an integer number (14278871197).

Almost surely, 2^28557742393 is an apocalyptic number.

It is an amenable number.

28557742393 is a deficient number, since it is larger than the sum of its proper divisors (1).

28557742393 is an equidigital number, since it uses as much as digits as its factorization.

28557742393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12700800, while the sum is 55.

The spelling of 28557742393 in words is "twenty-eight billion, five hundred fifty-seven million, seven hundred forty-two thousand, three hundred ninety-three".