28709011 has 2 divisors, whose sum is σ = 28709012. Its totient is φ = 28709010.

The previous prime is 28708961. The next prime is 28709017. The reversal of 28709011 is 11090782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28709011 - 2⁹ = 28708499 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28709017) 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, 14354505 + 14354506.

It is an arithmetic number, because the mean of its divisors is an integer number (14354506).

Almost surely, 2^28709011 is an apocalyptic number.

28709011 is a deficient number, since it is larger than the sum of its proper divisors (1).

28709011 is an equidigital number, since it uses as much as digits as its factorization.

28709011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 28709011 is about 5358.0790401038. The cubic root of 28709011 is about 306.2006281093.

Adding to 28709011 its reverse (11090782), we get a palindrome (39799793).

It can be divided in two parts, 2870 and 9011, that added together give a square (11881 = 109²).

The spelling of 28709011 in words is "twenty-eight million, seven hundred nine thousand, eleven".