28615216 has 120 divisors (see below), whose sum is σ = 72517680. Its totient is φ = 10838016.

The previous prime is 28615207. The next prime is 28615217. The reversal of 28615216 is 61251682.

It is not an unprimeable number, because it can be changed into a prime (28615217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 253176 + ... + 253288.

It is an arithmetic number, because the mean of its divisors is an integer number (604314).

Almost surely, 2^28615216 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 28615216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36258840).

28615216 is an abundant number, since it is smaller than the sum of its proper divisors (43902464).

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

28615216 is a wasteful number, since it uses less digits than its factorization.

28615216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171 (or 158 counting only the distinct ones).

The product of its digits is 5760, while the sum is 31.

The square root of 28615216 is about 5349.3192090209. The cubic root of 28615216 is about 305.8668023537.

Adding to 28615216 its reverse (61251682), we get a palindrome (89866898).

The spelling of 28615216 in words is "twenty-eight million, six hundred fifteen thousand, two hundred sixteen".