28117422 has 64 divisors (see below), whose sum is σ = 67003200. Its totient is φ = 8709120.

The previous prime is 28117417. The next prime is 28117423. The reversal of 28117422 is 22471182.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28117423) 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 31 ways as a sum of consecutive naturals, for example, 99922 + ... + 100202.

It is an arithmetic number, because the mean of its divisors is an integer number (1046925).

Almost surely, 2^28117422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28117422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33501600).

28117422 is an abundant number, since it is smaller than the sum of its proper divisors (38885778).

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

28117422 is a wasteful number, since it uses less digits than its factorization.

28117422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418 (or 412 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 28117422 is about 5302.5863500748. The cubic root of 28117422 is about 304.0827841835.

The spelling of 28117422 in words is "twenty-eight million, one hundred seventeen thousand, four hundred twenty-two".