28422216 has 96 divisors (see below), whose sum is σ = 81095040. Its totient is φ = 8982144.

The previous prime is 28422203. The next prime is 28422217. The reversal of 28422216 is 61222482.

It is a happy number.

28422216 is a `hidden beast` number, since 28 + 422 + 216 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 28422216.

It is not an unprimeable number, because it can be changed into a prime (28422217) 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, 125095 + ... + 125321.

It is an arithmetic number, because the mean of its divisors is an integer number (844740).

Almost surely, 2^28422216 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 28422216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40547520).

28422216 is an abundant number, since it is smaller than the sum of its proper divisors (52672824).

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

28422216 is a wasteful number, since it uses less digits than its factorization.

28422216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323 (or 316 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 28422216 is about 5331.2490093786. The cubic root of 28422216 is about 305.1775943224.

Adding to 28422216 its reverse (61222482), we get a palindrome (89644698).

It can be divided in two parts, 284 and 22216, that added together give a square (22500 = 150²).

The spelling of 28422216 in words is "twenty-eight million, four hundred twenty-two thousand, two hundred sixteen".