28271137 has 2 divisors, whose sum is σ = 28271138. Its totient is φ = 28271136.

The previous prime is 28271057. The next prime is 28271179. The reversal of 28271137 is 73117282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18974736 + 9296401 = 4356^2 + 3049^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28271137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28271099 and 28271108.

It is not a weakly prime, because it can be changed into another prime (28271237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14135568 + 14135569.

It is an arithmetic number, because the mean of its divisors is an integer number (14135569).

Almost surely, 2^28271137 is an apocalyptic number.

It is an amenable number.

28271137 is a deficient number, since it is larger than the sum of its proper divisors (1).

28271137 is an equidigital number, since it uses as much as digits as its factorization.

28271137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4704, while the sum is 31.

The square root of 28271137 is about 5317.0609362692. The cubic root of 28271137 is about 304.6359070231.

The spelling of 28271137 in words is "twenty-eight million, two hundred seventy-one thousand, one hundred thirty-seven".