28208216 has 8 divisors (see below), whose sum is σ = 52890420. Its totient is φ = 14104104.

The previous prime is 28208207. The next prime is 28208227. The reversal of 28208216 is 61280282.

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 1763006 + ... + 1763021.

Almost surely, 2^28208216 is an apocalyptic number.

It is an amenable number.

28208216 is a deficient number, since it is larger than the sum of its proper divisors (24682204).

28208216 is a wasteful number, since it uses less digits than its factorization.

28208216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3526033 (or 3526029 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 28208216 is about 5311.1407437574. The cubic root of 28208216 is about 304.4097372045.

Adding to 28208216 its reverse (61280282), we get a palindrome (89488498).

The spelling of 28208216 in words is "twenty-eight million, two hundred eight thousand, two hundred sixteen".