28965791 has 2 divisors, whose sum is σ = 28965792. Its totient is φ = 28965790.

The previous prime is 28965767. The next prime is 28965821. The reversal of 28965791 is 19756982.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28965791 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28965731) 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, 14482895 + 14482896.

It is an arithmetic number, because the mean of its divisors is an integer number (14482896).

Almost surely, 2^28965791 is an apocalyptic number.

28965791 is a deficient number, since it is larger than the sum of its proper divisors (1).

28965791 is an equidigital number, since it uses as much as digits as its factorization.

28965791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 47.

The square root of 28965791 is about 5381.9876439843. The cubic root of 28965791 is about 307.1108294194.

It can be divided in two parts, 2896 and 5791, that multiplied together give a triangular number (16770736 = T₅₇₉₁).

The spelling of 28965791 in words is "twenty-eight million, nine hundred sixty-five thousand, seven hundred ninety-one".