28217116 has 24 divisors (see below), whose sum is σ = 52279920. Its totient is φ = 13302912.

The previous prime is 28217089. The next prime is 28217131. The reversal of 28217116 is 61171282.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2160 + ... + 7816.

It is an arithmetic number, because the mean of its divisors is an integer number (2178330).

Almost surely, 2^28217116 is an apocalyptic number.

It is an amenable number.

28217116 is a deficient number, since it is larger than the sum of its proper divisors (24062804).

28217116 is a wasteful number, since it uses less digits than its factorization.

28217116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5733 (or 5731 counting only the distinct ones).

The product of its digits is 1344, while the sum is 28.

The square root of 28217116 is about 5311.9785391133. The cubic root of 28217116 is about 304.4417487029.

Adding to 28217116 its reverse (61171282), we get a palindrome (89388398).

The spelling of 28217116 in words is "twenty-eight million, two hundred seventeen thousand, one hundred sixteen".