28205712 has 80 divisors (see below), whose sum is σ = 81840000. Its totient is φ = 9300096.

The previous prime is 28205711. The next prime is 28205767. The reversal of 28205712 is 21750282.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (28205711) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 46789 + ... + 47387.

It is an arithmetic number, because the mean of its divisors is an integer number (1023000).

Almost surely, 2^28205712 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 28205712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40920000).

28205712 is an abundant number, since it is smaller than the sum of its proper divisors (53634288).

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

28205712 is a wasteful number, since it uses less digits than its factorization.

28205712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725 (or 713 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 28205712 is about 5310.9050076235. The cubic root of 28205712 is about 304.4007296097.

Adding to 28205712 its reverse (21750282), we get a palindrome (49955994).

The spelling of 28205712 in words is "twenty-eight million, two hundred five thousand, seven hundred twelve".