28216 has 8 divisors (see below), whose sum is σ = 52920. Its totient is φ = 14104.

The previous prime is 28211. The next prime is 28219. The reversal of 28216 is 61282.

It is a happy number.

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

It is a super-2 number, since 2×28216² = 1592285312, which contains 22 as substring.

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 28193 and 28202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1756 + ... + 1771.

It is an arithmetic number, because the mean of its divisors is an integer number (6615).

2²⁸²¹⁶ is an apocalyptic number.

It is an amenable number.

28216 is a deficient number, since it is larger than the sum of its proper divisors (24704).

28216 is a wasteful number, since it uses less digits than its factorization.

28216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3533 (or 3529 counting only the distinct ones).

The product of its digits is 192, while the sum is 19.

The square root of 28216 is about 167.9761887888. The cubic root of 28216 is about 30.4437735046.

Adding to 28216 its reverse (61282), we get a palindrome (89498).

The spelling of 28216 in words is "twenty-eight thousand, two hundred sixteen".