28356548393 has 2 divisors, whose sum is σ = 28356548394. Its totient is φ = 28356548392.

The previous prime is 28356548387. The next prime is 28356548401. The reversal of 28356548393 is 39384565382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24777278464 + 3579269929 = 157408^2 + 59827^2 .

It is a cyclic number.

It is not a de Polignac number, because 28356548393 - 2⁶ = 28356548329 is a prime.

It is not a weakly prime, because it can be changed into another prime (28356548333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14178274196 + 14178274197.

It is an arithmetic number, because the mean of its divisors is an integer number (14178274197).

Almost surely, 2^28356548393 is an apocalyptic number.

It is an amenable number.

28356548393 is a deficient number, since it is larger than the sum of its proper divisors (1).

28356548393 is an equidigital number, since it uses as much as digits as its factorization.

28356548393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18662400, while the sum is 56.

The spelling of 28356548393 in words is "twenty-eight billion, three hundred fifty-six million, five hundred forty-eight thousand, three hundred ninety-three".