28422186 has 32 divisors (see below), whose sum is σ = 61797120. Its totient is φ = 8662464.

The previous prime is 28422167. The next prime is 28422187. The reversal of 28422186 is 68122482.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28422187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6831 + ... + 10173.

It is an arithmetic number, because the mean of its divisors is an integer number (1931160).

Almost surely, 2^28422186 is an apocalyptic number.

28422186 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 28422186, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30898560).

28422186 is an abundant number, since it is smaller than the sum of its proper divisors (33374934).

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

28422186 is a wasteful number, since it uses less digits than its factorization.

28422186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3470.

The product of its digits is 12288, while the sum is 33.

The square root of 28422186 is about 5331.2461957782. The cubic root of 28422186 is about 305.1774869495.

The spelling of 28422186 in words is "twenty-eight million, four hundred twenty-two thousand, one hundred eighty-six".