28865911 has 2 divisors, whose sum is σ = 28865912. Its totient is φ = 28865910.

The previous prime is 28865887. The next prime is 28865987. The reversal of 28865911 is 11956882.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28865911 - 2¹⁹ = 28341623 is a 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 (25865911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14432955 + 14432956.

It is an arithmetic number, because the mean of its divisors is an integer number (14432956).

Almost surely, 2^28865911 is an apocalyptic number.

28865911 is a deficient number, since it is larger than the sum of its proper divisors (1).

28865911 is an equidigital number, since it uses as much as digits as its factorization.

28865911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 40.

The square root of 28865911 is about 5372.7005313901. The cubic root of 28865911 is about 306.7574291578.

The spelling of 28865911 in words is "twenty-eight million, eight hundred sixty-five thousand, nine hundred eleven".