28142316 has 48 divisors (see below), whose sum is σ = 73885280. Its totient is φ = 9377856.

The previous prime is 28142299. The next prime is 28142321. The reversal of 28142316 is 61324182.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28142316.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7140 + ... + 10356.

Almost surely, 2^28142316 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28142316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36942640).

28142316 is an abundant number, since it is smaller than the sum of its proper divisors (45742964).

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

28142316 is an equidigital number, since it uses as much as digits as its factorization.

28142316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3242 (or 3222 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 28142316 is about 5304.9331758279. The cubic root of 28142316 is about 304.1724984766.

Adding to 28142316 its reverse (61324182), we get a palindrome (89466498).

The spelling of 28142316 in words is "twenty-eight million, one hundred forty-two thousand, three hundred sixteen".