28786812 has 12 divisors (see below), whose sum is σ = 67169256. Its totient is φ = 9595600.

The previous prime is 28786789. The next prime is 28786819. The reversal of 28786812 is 21868782.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28786819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1199439 + ... + 1199462.

It is an arithmetic number, because the mean of its divisors is an integer number (5597438).

Almost surely, 2^28786812 is an apocalyptic number.

It is an amenable number.

28786812 is an abundant number, since it is smaller than the sum of its proper divisors (38382444).

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

28786812 is a wasteful number, since it uses less digits than its factorization.

28786812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2398908 (or 2398906 counting only the distinct ones).

The product of its digits is 86016, while the sum is 42.

The square root of 28786812 is about 5365.3342859509. The cubic root of 28786812 is about 306.4769783659.

The spelling of 28786812 in words is "twenty-eight million, seven hundred eighty-six thousand, eight hundred twelve".