28171242 has 48 divisors (see below), whose sum is σ = 67466880. Its totient is φ = 8424000.

The previous prime is 28171237. The next prime is 28171271. The reversal of 28171242 is 24217182.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14742 + ... + 16542.

It is an arithmetic number, because the mean of its divisors is an integer number (1405560).

Almost surely, 2^28171242 is an apocalyptic number.

28171242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 28171242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33733440).

28171242 is an abundant number, since it is smaller than the sum of its proper divisors (39295638).

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

28171242 is a wasteful number, since it uses less digits than its factorization.

28171242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1899 (or 1896 counting only the distinct ones).

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

The square root of 28171242 is about 5307.6588059143. The cubic root of 28171242 is about 304.2766770726.

The spelling of 28171242 in words is "twenty-eight million, one hundred seventy-one thousand, two hundred forty-two".