28043117 has 2 divisors, whose sum is σ = 28043118. Its totient is φ = 28043116.

The previous prime is 28043053. The next prime is 28043129. The reversal of 28043117 is 71134082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14945956 + 13097161 = 3866^2 + 3619^2 .

It is a cyclic number.

It is not a de Polignac number, because 28043117 - 2⁶ = 28043053 is a prime.

It is a super-2 number, since 2×28043117² = 1572832822151378, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28043167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14021558 + 14021559.

It is an arithmetic number, because the mean of its divisors is an integer number (14021559).

Almost surely, 2^28043117 is an apocalyptic number.

It is an amenable number.

28043117 is a deficient number, since it is larger than the sum of its proper divisors (1).

28043117 is an equidigital number, since it uses as much as digits as its factorization.

28043117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 28043117 is about 5295.5752284336. The cubic root of 28043117 is about 303.8146846385.

Adding to 28043117 its reverse (71134082), we get a palindrome (99177199).

The spelling of 28043117 in words is "twenty-eight million, forty-three thousand, one hundred seventeen".