28147813 has 2 divisors, whose sum is σ = 28147814. Its totient is φ = 28147812.

The previous prime is 28147807. The next prime is 28147831. The reversal of 28147813 is 31874182.

It is a happy number.

Together with next prime (28147831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14730244 + 13417569 = 3838^2 + 3663^2 .

It is a cyclic number.

It is not a de Polignac number, because 28147813 - 2⁵ = 28147781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28147513) 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, 14073906 + 14073907.

It is an arithmetic number, because the mean of its divisors is an integer number (14073907).

Almost surely, 2^28147813 is an apocalyptic number.

It is an amenable number.

28147813 is a deficient number, since it is larger than the sum of its proper divisors (1).

28147813 is an equidigital number, since it uses as much as digits as its factorization.

28147813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 34.

The square root of 28147813 is about 5305.4512531923. The cubic root of 28147813 is about 304.1923017197.

The spelling of 28147813 in words is "twenty-eight million, one hundred forty-seven thousand, eight hundred thirteen".