28186812 has 48 divisors (see below), whose sum is σ = 75443200. Its totient is φ = 9091440.

The previous prime is 28186783. The next prime is 28186813. The reversal of 28186812 is 21868182.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28186813) 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 15 ways as a sum of consecutive naturals, for example, 862 + ... + 7557.

Almost surely, 2^28186812 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28186812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37721600).

28186812 is an abundant number, since it is smaller than the sum of its proper divisors (47256388).

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

28186812 is a wasteful number, since it uses less digits than its factorization.

28186812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8463 (or 8455 counting only the distinct ones).

The product of its digits is 12288, while the sum is 36.

The square root of 28186812 is about 5309.1253516940. The cubic root of 28186812 is about 304.3327237712.

The spelling of 28186812 in words is "twenty-eight million, one hundred eighty-six thousand, eight hundred twelve".