28041216 has 112 divisors (see below), whose sum is σ = 85977984. Its totient is φ = 7962624.

The previous prime is 28041199. The next prime is 28041217. The reversal of 28041216 is 61214082.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28041217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171951 + ... + 172113.

Almost surely, 2^28041216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28041216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42988992).

28041216 is an abundant number, since it is smaller than the sum of its proper divisors (57936768).

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

28041216 is an equidigital number, since it uses as much as digits as its factorization.

28041216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 28041216 is about 5295.3957359200. The cubic root of 28041216 is about 303.8078194392.

Adding to 28041216 its reverse (61214082), we get a palindrome (89255298).

The spelling of 28041216 in words is "twenty-eight million, forty-one thousand, two hundred sixteen".