28134217 has 2 divisors, whose sum is σ = 28134218. Its totient is φ = 28134216.

The previous prime is 28134181. The next prime is 28134251. The reversal of 28134217 is 71243182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23853456 + 4280761 = 4884^2 + 2069^2 .

It is a cyclic number.

It is not a de Polignac number, because 28134217 - 2¹⁵ = 28101449 is a prime.

It is not a weakly prime, because it can be changed into another prime (28134287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14067108 + 14067109.

It is an arithmetic number, because the mean of its divisors is an integer number (14067109).

Almost surely, 2^28134217 is an apocalyptic number.

It is an amenable number.

28134217 is a deficient number, since it is larger than the sum of its proper divisors (1).

28134217 is an equidigital number, since it uses as much as digits as its factorization.

28134217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 28.

The square root of 28134217 is about 5304.1697748092. The cubic root of 28134217 is about 304.1433166871.

Adding to 28134217 its reverse (71243182), we get a palindrome (99377399).

The spelling of 28134217 in words is "twenty-eight million, one hundred thirty-four thousand, two hundred seventeen".