28140812 has 12 divisors (see below), whose sum is σ = 56281680. Its totient is φ = 12060336.

The previous prime is 28140811. The next prime is 28140829. The reversal of 28140812 is 21804182.

28140812 is an admirable number.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28140811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502487 + ... + 502542.

It is an arithmetic number, because the mean of its divisors is an integer number (4690140).

Almost surely, 2^28140812 is an apocalyptic number.

It is an amenable number.

28140812 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28140812 is a wasteful number, since it uses less digits than its factorization.

28140812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005040 (or 1005038 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 28140812 is about 5304.7914190852. The cubic root of 28140812 is about 304.1670797851.

Adding to 28140812 its reverse (21804182), we get a palindrome (49944994).

The spelling of 28140812 in words is "twenty-eight million, one hundred forty thousand, eight hundred twelve".