28985887 has 16 divisors (see below), whose sum is σ = 35619840. Its totient is φ = 23031648.

The previous prime is 28985863. The next prime is 28985903. The reversal of 28985887 is 78858982.

It is a de Polignac number, because none of the positive numbers 2^k-28985887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28985387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3933 + ... + 8569.

It is an arithmetic number, because the mean of its divisors is an integer number (2226240).

Almost surely, 2^28985887 is an apocalyptic number.

28985887 is a deficient number, since it is larger than the sum of its proper divisors (6633953).

28985887 is a wasteful number, since it uses less digits than its factorization.

28985887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4710.

The product of its digits is 2580480, while the sum is 55.

The square root of 28985887 is about 5383.8542885186. The cubic root of 28985887 is about 307.1818358525.

The spelling of 28985887 in words is "twenty-eight million, nine hundred eighty-five thousand, eight hundred eighty-seven".