28969387 has 2 divisors, whose sum is σ = 28969388. Its totient is φ = 28969386.

The previous prime is 28969373. The next prime is 28969403. The reversal of 28969387 is 78396982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28969387 - 2¹⁵ = 28936619 is a prime.

It is not a weakly prime, because it can be changed into another prime (28969307) 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, 14484693 + 14484694.

It is an arithmetic number, because the mean of its divisors is an integer number (14484694).

Almost surely, 2^28969387 is an apocalyptic number.

28969387 is a deficient number, since it is larger than the sum of its proper divisors (1).

28969387 is an equidigital number, since it uses as much as digits as its factorization.

28969387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 52.

The square root of 28969387 is about 5382.3217109348. The cubic root of 28969387 is about 307.1235377995.

The spelling of 28969387 in words is "twenty-eight million, nine hundred sixty-nine thousand, three hundred eighty-seven".