28116220 has 48 divisors (see below), whose sum is σ = 64810368. Its totient is φ = 10160960.

The previous prime is 28116217. The next prime is 28116229. The reversal of 28116220 is 2261182.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 28116191 and 28116200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28116229) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 49659 + ... + 50221.

It is an arithmetic number, because the mean of its divisors is an integer number (1350216).

Almost surely, 2^28116220 is an apocalyptic number.

28116220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28116220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32405184).

28116220 is an abundant number, since it is smaller than the sum of its proper divisors (36694148).

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

28116220 is a wasteful number, since it uses less digits than its factorization.

28116220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810 (or 808 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 28116220 is about 5302.4730079464. The cubic root of 28116220 is about 304.0784510134.

It can be divided in two parts, 281162 and 20, that added together give a palindrome (281182).

The spelling of 28116220 in words is "twenty-eight million, one hundred sixteen thousand, two hundred twenty".