28871565 has 16 divisors (see below), whose sum is σ = 46673088. Its totient is φ = 15238656.

The previous prime is 28871561. The next prime is 28871567. The reversal of 28871565 is 56517882.

It is not a de Polignac number, because 28871565 - 2² = 28871561 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28871561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8467 + ... + 11376.

It is an arithmetic number, because the mean of its divisors is an integer number (2917068).

Almost surely, 2^28871565 is an apocalyptic number.

It is an amenable number.

28871565 is a deficient number, since it is larger than the sum of its proper divisors (17801523).

28871565 is a wasteful number, since it uses less digits than its factorization.

28871565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19948.

The product of its digits is 134400, while the sum is 42.

The square root of 28871565 is about 5373.2266842187. The cubic root of 28871565 is about 306.7774561633. Note that the first 3 decimals are identical.

The spelling of 28871565 in words is "twenty-eight million, eight hundred seventy-one thousand, five hundred sixty-five".