28864385 has 16 divisors (see below), whose sum is σ = 40010112. Its totient is φ = 19756800.

The previous prime is 28864361. The next prime is 28864421. The reversal of 28864385 is 58346882.

It is not a de Polignac number, because 28864385 - 2⁶ = 28864321 is a prime.

It is a Curzon number.

It is an unprimeable number.

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, 14501 + ... + 16370.

It is an arithmetic number, because the mean of its divisors is an integer number (2500632).

Almost surely, 2^28864385 is an apocalyptic number.

It is an amenable number.

28864385 is a deficient number, since it is larger than the sum of its proper divisors (11145727).

28864385 is a wasteful number, since it uses less digits than its factorization.

28864385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30904.

The product of its digits is 368640, while the sum is 44.

The square root of 28864385 is about 5372.5585152700. The cubic root of 28864385 is about 306.7520234725.

The spelling of 28864385 in words is "twenty-eight million, eight hundred sixty-four thousand, three hundred eighty-five".