28287216 has 30 divisors (see below), whose sum is σ = 79165320. Its totient is φ = 9429024.

The previous prime is 28287197. The next prime is 28287229. The reversal of 28287216 is 61278282.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 5 ways as a sum of consecutive naturals, for example, 98076 + ... + 98363.

It is an arithmetic number, because the mean of its divisors is an integer number (2638844).

Almost surely, 2^28287216 is an apocalyptic number.

It is an amenable number.

28287216 is an abundant number, since it is smaller than the sum of its proper divisors (50878104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28287216 is a wasteful number, since it uses less digits than its factorization.

28287216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196453 (or 196444 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 28287216 is about 5318.5727408770. The cubic root of 28287216 is about 304.6936492171.

The spelling of 28287216 in words is "twenty-eight million, two hundred eighty-seven thousand, two hundred sixteen".