28280712 has 16 divisors (see below), whose sum is σ = 70701840. Its totient is φ = 9426896.

The previous prime is 28280701. The next prime is 28280717. The reversal of 28280712 is 21708282.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28280712.

It is not an unprimeable number, because it can be changed into a prime (28280717) 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, 589158 + ... + 589205.

It is an arithmetic number, because the mean of its divisors is an integer number (4418865).

Almost surely, 2^28280712 is an apocalyptic number.

It is an amenable number.

28280712 is an abundant number, since it is smaller than the sum of its proper divisors (42421128).

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

28280712 is a wasteful number, since it uses less digits than its factorization.

28280712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178372 (or 1178368 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 28280712 is about 5317.9612634919. The cubic root of 28280712 is about 304.6702949759.

Adding to 28280712 its reverse (21708282), we get a palindrome (49988994).

The spelling of 28280712 in words is "twenty-eight million, two hundred eighty thousand, seven hundred twelve".