28142312 has 32 divisors (see below), whose sum is σ = 58272480. Its totient is φ = 12634560.

The previous prime is 28142299. The next prime is 28142321. The reversal of 28142312 is 21324182.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5378 + ... + 9230.

It is an arithmetic number, because the mean of its divisors is an integer number (1821015).

Almost surely, 2^28142312 is an apocalyptic number.

28142312 is a gapful number since it is divisible by the number (22) 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 28142312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29136240).

28142312 is an abundant number, since it is smaller than the sum of its proper divisors (30130168).

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

28142312 is a wasteful number, since it uses less digits than its factorization.

28142312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3953 (or 3949 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 28142312 is about 5304.9327988204. The cubic root of 28142312 is about 304.1724840655.

Adding to 28142312 its reverse (21324182), we get a palindrome (49466494).

The spelling of 28142312 in words is "twenty-eight million, one hundred forty-two thousand, three hundred twelve".