28279117 has 2 divisors, whose sum is σ = 28279118. Its totient is φ = 28279116.

The previous prime is 28279093. The next prime is 28279151. The reversal of 28279117 is 71197282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28185481 + 93636 = 5309^2 + 306^2 .

It is a cyclic number.

It is not a de Polignac number, because 28279117 - 2¹⁵ = 28246349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28279187) 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, 14139558 + 14139559.

It is an arithmetic number, because the mean of its divisors is an integer number (14139559).

Almost surely, 2^28279117 is an apocalyptic number.

It is an amenable number.

28279117 is a deficient number, since it is larger than the sum of its proper divisors (1).

28279117 is an equidigital number, since it uses as much as digits as its factorization.

28279117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 37.

The square root of 28279117 is about 5317.8112978931. The cubic root of 28279117 is about 304.6645671821.

The spelling of 28279117 in words is "twenty-eight million, two hundred seventy-nine thousand, one hundred seventeen".