28009516 has 12 divisors (see below), whose sum is σ = 49688632. Its totient is φ = 13812768.

The previous prime is 28009463. The next prime is 28009537. The reversal of 28009516 is 61590082.

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, 47670 + ... + 48253.

Almost surely, 2^28009516 is an apocalyptic number.

It is an amenable number.

28009516 is a deficient number, since it is larger than the sum of its proper divisors (21679116).

28009516 is a wasteful number, since it uses less digits than its factorization.

28009516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96000 (or 95998 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 28009516 is about 5292.4017232255. The cubic root of 28009516 is about 303.6932935063.

Adding to 28009516 its reverse (61590082), we get a palindrome (89599598).

The spelling of 28009516 in words is "twenty-eight million, nine thousand, five hundred sixteen".