28708417 has 2 divisors, whose sum is σ = 28708418. Its totient is φ = 28708416.

The previous prime is 28708403. The next prime is 28708423. The reversal of 28708417 is 71480782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26224641 + 2483776 = 5121^2 + 1576^2 .

It is a cyclic number.

It is not a de Polignac number, because 28708417 - 2²³ = 20319809 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28708517) 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, 14354208 + 14354209.

It is an arithmetic number, because the mean of its divisors is an integer number (14354209).

Almost surely, 2^28708417 is an apocalyptic number.

It is an amenable number.

28708417 is a deficient number, since it is larger than the sum of its proper divisors (1).

28708417 is an equidigital number, since it uses as much as digits as its factorization.

28708417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 28708417 is about 5358.0236095038. The cubic root of 28708417 is about 306.1985162935.

The spelling of 28708417 in words is "twenty-eight million, seven hundred eight thousand, four hundred seventeen".