28956571 has 4 divisors (see below), whose sum is σ = 33093232. Its totient is φ = 24819912.

The previous prime is 28956553. The next prime is 28956601. The reversal of 28956571 is 17565982.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28956571 - 2⁷ = 28956443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28956271) 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 in 3 ways as a sum of consecutive naturals, for example, 2068320 + ... + 2068333.

It is an arithmetic number, because the mean of its divisors is an integer number (8273308).

Almost surely, 2^28956571 is an apocalyptic number.

28956571 is a deficient number, since it is larger than the sum of its proper divisors (4136661).

28956571 is an equidigital number, since it uses as much as digits as its factorization.

28956571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4136660.

The product of its digits is 151200, while the sum is 43.

The square root of 28956571 is about 5381.1310149447. The cubic root of 28956571 is about 307.0782408355.

The spelling of 28956571 in words is "twenty-eight million, nine hundred fifty-six thousand, five hundred seventy-one".