28840012 has 12 divisors (see below), whose sum is σ = 50727600. Its totient is φ = 14346416.

The previous prime is 28840001. The next prime is 28840027. The reversal of 28840012 is 21004882.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17512 + ... + 19087.

It is an arithmetic number, because the mean of its divisors is an integer number (4227300).

Almost surely, 2^28840012 is an apocalyptic number.

It is an amenable number.

28840012 is a deficient number, since it is larger than the sum of its proper divisors (21887588).

28840012 is a wasteful number, since it uses less digits than its factorization.

28840012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36800 (or 36798 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 28840012 is about 5370.2897500973. The cubic root of 28840012 is about 306.6656589969.

Adding to 28840012 its reverse (21004882), we get a palindrome (49844894).

The spelling of 28840012 in words is "twenty-eight million, eight hundred forty thousand, twelve".