28252117 has 2 divisors, whose sum is σ = 28252118. Its totient is φ = 28252116.

The previous prime is 28252057. The next prime is 28252151. The reversal of 28252117 is 71125282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20711601 + 7540516 = 4551^2 + 2746^2 .

It is a cyclic number.

It is not a de Polignac number, because 28252117 - 2²³ = 19863509 is a prime.

It is a super-2 number, since 2×28252117² = 1596364229963378, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28252187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14126058 + 14126059.

It is an arithmetic number, because the mean of its divisors is an integer number (14126059).

Almost surely, 2^28252117 is an apocalyptic number.

It is an amenable number.

28252117 is a deficient number, since it is larger than the sum of its proper divisors (1).

28252117 is an equidigital number, since it uses as much as digits as its factorization.

28252117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 28.

The square root of 28252117 is about 5315.2720532443. The cubic root of 28252117 is about 304.5675749663.

Adding to 28252117 its reverse (71125282), we get a palindrome (99377399).

The spelling of 28252117 in words is "twenty-eight million, two hundred fifty-two thousand, one hundred seventeen".