28278713 has 2 divisors, whose sum is σ = 28278714. Its totient is φ = 28278712.

The previous prime is 28278697. The next prime is 28278739. The reversal of 28278713 is 31787282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27331984 + 946729 = 5228^2 + 973^2 .

It is a cyclic number.

It is not a de Polignac number, because 28278713 - 2⁴ = 28278697 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28278743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14139356 + 14139357.

It is an arithmetic number, because the mean of its divisors is an integer number (14139357).

Almost surely, 2^28278713 is an apocalyptic number.

It is an amenable number.

28278713 is a deficient number, since it is larger than the sum of its proper divisors (1).

28278713 is an equidigital number, since it uses as much as digits as its factorization.

28278713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 38.

The square root of 28278713 is about 5317.7733122050. The cubic root of 28278713 is about 304.6631163463.

The spelling of 28278713 in words is "twenty-eight million, two hundred seventy-eight thousand, seven hundred thirteen".