28375475549 has 2 divisors, whose sum is σ = 28375475550. Its totient is φ = 28375475548.

The previous prime is 28375475519. The next prime is 28375475573. The reversal of 28375475549 is 94557457382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28188059449 + 187416100 = 167893^2 + 13690^2 .

It is a cyclic number.

It is not a de Polignac number, because 28375475549 - 2²⁰ = 28374426973 is a prime.

It is a super-2 number, since 2×28375475549² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28375475519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14187737774 + 14187737775.

It is an arithmetic number, because the mean of its divisors is an integer number (14187737775).

Almost surely, 2^28375475549 is an apocalyptic number.

It is an amenable number.

28375475549 is a deficient number, since it is larger than the sum of its proper divisors (1).

28375475549 is an equidigital number, since it uses as much as digits as its factorization.

28375475549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336000, while the sum is 59.

The spelling of 28375475549 in words is "twenty-eight billion, three hundred seventy-five million, four hundred seventy-five thousand, five hundred forty-nine".