28727689 has 2 divisors, whose sum is σ = 28727690. Its totient is φ = 28727688.

The previous prime is 28727683. The next prime is 28727701. The reversal of 28727689 is 98672782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20548089 + 8179600 = 4533^2 + 2860^2 .

It is a cyclic number.

It is not a de Polignac number, because 28727689 - 2⁹ = 28727177 is a prime.

It is not a weakly prime, because it can be changed into another prime (28727683) 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, 14363844 + 14363845.

It is an arithmetic number, because the mean of its divisors is an integer number (14363845).

Almost surely, 2^28727689 is an apocalyptic number.

It is an amenable number.

28727689 is a deficient number, since it is larger than the sum of its proper divisors (1).

28727689 is an equidigital number, since it uses as much as digits as its factorization.

28727689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 49.

The square root of 28727689 is about 5359.8217321101. The cubic root of 28727689 is about 306.2670181297.

The spelling of 28727689 in words is "twenty-eight million, seven hundred twenty-seven thousand, six hundred eighty-nine".