28220016 has 160 divisors (see below), whose sum is σ = 87494400. Its totient is φ = 7741440.

The previous prime is 28219999. The next prime is 28220021. The reversal of 28220016 is 61002282.

It is a junction number, because it is equal to n+sod(n) for n = 28219974 and 28220001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 290880 + ... + 290976.

It is an arithmetic number, because the mean of its divisors is an integer number (546840).

Almost surely, 2^28220016 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 28220016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43747200).

28220016 is an abundant number, since it is smaller than the sum of its proper divisors (59274384).

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

28220016 is a wasteful number, since it uses less digits than its factorization.

28220016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 28220016 is about 5312.2515000704. The cubic root of 28220016 is about 304.4521779618.

Adding to 28220016 its reverse (61002282), we get a palindrome (89222298).

The spelling of 28220016 in words is "twenty-eight million, two hundred twenty thousand, sixteen".