28184220 has 192 divisors, whose sum is σ = 95961600. Its totient is φ = 6842880.

The previous prime is 28184209. The next prime is 28184237. The reversal of 28184220 is 2248182.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 63 ways as a sum of consecutive naturals, for example, 420627 + ... + 420693.

It is an arithmetic number, because the mean of its divisors is an integer number (499800).

Almost surely, 2^28184220 is an apocalyptic number.

28184220 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 28184220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47980800).

28184220 is an abundant number, since it is smaller than the sum of its proper divisors (67777380).

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

28184220 is a wasteful number, since it uses less digits than its factorization.

28184220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 28184220 is about 5308.8812380764. The cubic root of 28184220 is about 304.3233948860.

The spelling of 28184220 in words is "twenty-eight million, one hundred eighty-four thousand, two hundred twenty".