28342475261 has 2 divisors, whose sum is σ = 28342475262. Its totient is φ = 28342475260.

The previous prime is 28342475243. The next prime is 28342475309. The reversal of 28342475261 is 16257424382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27136302361 + 1206172900 = 164731^2 + 34730^2 .

It is a cyclic number.

It is not a de Polignac number, because 28342475261 - 2²⁶ = 28275366397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28342475761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14171237630 + 14171237631.

It is an arithmetic number, because the mean of its divisors is an integer number (14171237631).

Almost surely, 2^28342475261 is an apocalyptic number.

It is an amenable number.

28342475261 is a deficient number, since it is larger than the sum of its proper divisors (1).

28342475261 is an equidigital number, since it uses as much as digits as its factorization.

28342475261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 44.

The spelling of 28342475261 in words is "twenty-eight billion, three hundred forty-two million, four hundred seventy-five thousand, two hundred sixty-one".