28143812 has 24 divisors (see below), whose sum is σ = 51710400. Its totient is φ = 13377056.

The previous prime is 28143809. The next prime is 28143827. The reversal of 28143812 is 21834182.

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, 15614 + ... + 17322.

It is an arithmetic number, because the mean of its divisors is an integer number (2154600).

Almost surely, 2^28143812 is an apocalyptic number.

It is an amenable number.

28143812 is a deficient number, since it is larger than the sum of its proper divisors (23566588).

28143812 is a wasteful number, since it uses less digits than its factorization.

28143812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1915 (or 1913 counting only the distinct ones).

The product of its digits is 3072, while the sum is 29.

The square root of 28143812 is about 5305.0741747878. The cubic root of 28143812 is about 304.1778881538.

Adding to 28143812 its reverse (21834182), we get a palindrome (49977994).

The spelling of 28143812 in words is "twenty-eight million, one hundred forty-three thousand, eight hundred twelve".