28272689 has 2 divisors, whose sum is σ = 28272690. Its totient is φ = 28272688.

The previous prime is 28272679. The next prime is 28272701. The reversal of 28272689 is 98627282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24403600 + 3869089 = 4940^2 + 1967^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28272689 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28272659) 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, 14136344 + 14136345.

It is an arithmetic number, because the mean of its divisors is an integer number (14136345).

Almost surely, 2^28272689 is an apocalyptic number.

It is an amenable number.

28272689 is a deficient number, since it is larger than the sum of its proper divisors (1).

28272689 is an equidigital number, since it uses as much as digits as its factorization.

28272689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 44.

The square root of 28272689 is about 5317.2068795562. The cubic root of 28272689 is about 304.6414814514.

The spelling of 28272689 in words is "twenty-eight million, two hundred seventy-two thousand, six hundred eighty-nine".