28643216 has 20 divisors (see below), whose sum is σ = 63424512. Its totient is φ = 12275616.

The previous prime is 28643207. The next prime is 28643233. The reversal of 28643216 is 61234682.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127760 + ... + 127983.

Almost surely, 2^28643216 is an apocalyptic number.

It is an amenable number.

28643216 is an abundant number, since it is smaller than the sum of its proper divisors (34781296).

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

28643216 is a wasteful number, since it uses less digits than its factorization.

28643216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255758 (or 255752 counting only the distinct ones).

The product of its digits is 13824, while the sum is 32.

The square root of 28643216 is about 5351.9357245767. The cubic root of 28643216 is about 305.9665334268.

Adding to 28643216 its reverse (61234682), we get a palindrome (89877898).

The spelling of 28643216 in words is "twenty-eight million, six hundred forty-three thousand, two hundred sixteen".