28279913 has 2 divisors, whose sum is σ = 28279914. Its totient is φ = 28279912.

The previous prime is 28279871. The next prime is 28279931. The reversal of 28279913 is 31997282.

It is a happy number.

Together with next prime (28279931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27962944 + 316969 = 5288^2 + 563^2 .

It is a cyclic number.

It is not a de Polignac number, because 28279913 - 2¹² = 28275817 is a prime.

It is not a weakly prime, because it can be changed into another prime (28279943) 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, 14139956 + 14139957.

It is an arithmetic number, because the mean of its divisors is an integer number (14139957).

Almost surely, 2^28279913 is an apocalyptic number.

It is an amenable number.

28279913 is a deficient number, since it is larger than the sum of its proper divisors (1).

28279913 is an equidigital number, since it uses as much as digits as its factorization.

28279913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 28279913 is about 5317.8861401877. The cubic root of 28279913 is about 304.6674257193.

It can be divided in two parts, 28279 and 913, that added together give a palindrome (29192).

The spelling of 28279913 in words is "twenty-eight million, two hundred seventy-nine thousand, nine hundred thirteen".