28517429 has 2 divisors, whose sum is σ = 28517430. Its totient is φ = 28517428.

The previous prime is 28517413. The next prime is 28517431. The reversal of 28517429 is 92471582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26801329 + 1716100 = 5177^2 + 1310^2 .

It is a cyclic number.

It is not a de Polignac number, because 28517429 - 2⁴ = 28517413 is a prime.

Together with 28517431, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28517392 and 28517401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28517459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14258714 + 14258715.

It is an arithmetic number, because the mean of its divisors is an integer number (14258715).

Almost surely, 2^28517429 is an apocalyptic number.

It is an amenable number.

28517429 is a deficient number, since it is larger than the sum of its proper divisors (1).

28517429 is an equidigital number, since it uses as much as digits as its factorization.

28517429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 38.

The square root of 28517429 is about 5340.1712519357. The cubic root of 28517429 is about 305.5179910527.

The spelling of 28517429 in words is "twenty-eight million, five hundred seventeen thousand, four hundred twenty-nine".