28969517 has 2 divisors, whose sum is σ = 28969518. Its totient is φ = 28969516.

The previous prime is 28969511. The next prime is 28969541. The reversal of 28969517 is 71596982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28793956 + 175561 = 5366^2 + 419^2 .

It is a cyclic number.

It is not a de Polignac number, because 28969517 - 2⁶ = 28969453 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 (28969511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14484758 + 14484759.

It is an arithmetic number, because the mean of its divisors is an integer number (14484759).

Almost surely, 2^28969517 is an apocalyptic number.

It is an amenable number.

28969517 is a deficient number, since it is larger than the sum of its proper divisors (1).

28969517 is an equidigital number, since it uses as much as digits as its factorization.

28969517 is an evil number, because the sum of its binary digits is even.

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

The square root of 28969517 is about 5382.3337874940. Note that the first 3 decimals coincide. The cubic root of 28969517 is about 307.1239972040.

The spelling of 28969517 in words is "twenty-eight million, nine hundred sixty-nine thousand, five hundred seventeen".