28513812 has 24 divisors (see below), whose sum is σ = 66661056. Its totient is φ = 9486208.

The previous prime is 28513801. The next prime is 28513861. The reversal of 28513812 is 21831582.

It is a self number, because there is not a number n which added to its sum of digits gives 28513812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5113 + ... + 9119.

It is an arithmetic number, because the mean of its divisors is an integer number (2777544).

Almost surely, 2^28513812 is an apocalyptic number.

It is an amenable number.

28513812 is an abundant number, since it is smaller than the sum of its proper divisors (38147244).

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

28513812 is a wasteful number, since it uses less digits than its factorization.

28513812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4607 (or 4605 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 28513812 is about 5339.8325816452. The cubic root of 28513812 is about 305.5050737441.

The spelling of 28513812 in words is "twenty-eight million, five hundred thirteen thousand, eight hundred twelve".