28364548181 has 2 divisors, whose sum is σ = 28364548182. Its totient is φ = 28364548180.

The previous prime is 28364548171. The next prime is 28364548273. The reversal of 28364548181 is 18184546382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25557137956 + 2807410225 = 159866^2 + 52985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28364548181 is a prime.

It is a super-2 number, since 2×28364548181² (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 (28364548111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14182274090 + 14182274091.

It is an arithmetic number, because the mean of its divisors is an integer number (14182274091).

Almost surely, 2^28364548181 is an apocalyptic number.

It is an amenable number.

28364548181 is a deficient number, since it is larger than the sum of its proper divisors (1).

28364548181 is an equidigital number, since it uses as much as digits as its factorization.

28364548181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1474560, while the sum is 50.

The spelling of 28364548181 in words is "twenty-eight billion, three hundred sixty-four million, five hundred forty-eight thousand, one hundred eighty-one".