28507571 has 2 divisors, whose sum is σ = 28507572. Its totient is φ = 28507570.

The previous prime is 28507529. The next prime is 28507573. The reversal of 28507571 is 17570582.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28507571 is a prime.

Together with 28507573, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28507573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14253785 + 14253786.

It is an arithmetic number, because the mean of its divisors is an integer number (14253786).

Almost surely, 2^28507571 is an apocalyptic number.

28507571 is a deficient number, since it is larger than the sum of its proper divisors (1).

28507571 is an equidigital number, since it uses as much as digits as its factorization.

28507571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19600, while the sum is 35.

The square root of 28507571 is about 5339.2481680476. The cubic root of 28507571 is about 305.4827828360.

The spelling of 28507571 in words is "twenty-eight million, five hundred seven thousand, five hundred seventy-one".