28127249 has 2 divisors, whose sum is σ = 28127250. Its totient is φ = 28127248.

The previous prime is 28127221. The next prime is 28127251. The reversal of 28127249 is 94272182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28090000 + 37249 = 5300^2 + 193^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28127249 is a prime.

It is a super-2 number, since 2×28127249² = 1582284272616002, which contains 22 as substring.

Together with 28127251, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28120249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14063624 + 14063625.

It is an arithmetic number, because the mean of its divisors is an integer number (14063625).

Almost surely, 2^28127249 is an apocalyptic number.

It is an amenable number.

28127249 is a deficient number, since it is larger than the sum of its proper divisors (1).

28127249 is an equidigital number, since it uses as much as digits as its factorization.

28127249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 35.

The square root of 28127249 is about 5303.5128924139. The cubic root of 28127249 is about 304.1182055610.

The spelling of 28127249 in words is "twenty-eight million, one hundred twenty-seven thousand, two hundred forty-nine".