28906117 has 2 divisors, whose sum is σ = 28906118. Its totient is φ = 28906116.

The previous prime is 28906093. The next prime is 28906121. The reversal of 28906117 is 71160982.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20061441 + 8844676 = 4479^2 + 2974^2 .

It is a cyclic number.

It is not a de Polignac number, because 28906117 - 2¹¹ = 28904069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28906177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14453058 + 14453059.

It is an arithmetic number, because the mean of its divisors is an integer number (14453059).

Almost surely, 2^28906117 is an apocalyptic number.

It is an amenable number.

28906117 is a deficient number, since it is larger than the sum of its proper divisors (1).

28906117 is an equidigital number, since it uses as much as digits as its factorization.

28906117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 28906117 is about 5376.4409231387. The cubic root of 28906117 is about 306.8997858563.

The spelling of 28906117 in words is "twenty-eight million, nine hundred six thousand, one hundred seventeen".