28647885 has 32 divisors (see below), whose sum is σ = 52641792. Its totient is φ = 13032000.

The previous prime is 28647869. The next prime is 28647893. The reversal of 28647885 is 58874682.

It is not a de Polignac number, because 28647885 - 2⁴ = 28647869 is a prime.

It is a congruent 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 31 ways as a sum of consecutive naturals, for example, 25812 + ... + 26898.

It is an arithmetic number, because the mean of its divisors is an integer number (1645056).

Almost surely, 2^28647885 is an apocalyptic number.

It is an amenable number.

28647885 is a deficient number, since it is larger than the sum of its proper divisors (23993907).

28647885 is a wasteful number, since it uses less digits than its factorization.

28647885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353.

The product of its digits is 860160, while the sum is 48.

The square root of 28647885 is about 5352.3719041188. The cubic root of 28647885 is about 305.9831572600.

The spelling of 28647885 in words is "twenty-eight million, six hundred forty-seven thousand, eight hundred eighty-five".