28225312 has 24 divisors (see below), whose sum is σ = 56243376. Its totient is φ = 13941312.

The previous prime is 28225271. The next prime is 28225319. The reversal of 28225312 is 21352282.

It is not an unprimeable number, because it can be changed into a prime (28225319) 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, 2658 + ... + 7969.

It is an arithmetic number, because the mean of its divisors is an integer number (2343474).

Almost surely, 2^28225312 is an apocalyptic number.

It is an amenable number.

28225312 is a deficient number, since it is larger than the sum of its proper divisors (28018064).

28225312 is a wasteful number, since it uses less digits than its factorization.

28225312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10720 (or 10712 counting only the distinct ones).

The product of its digits is 1920, while the sum is 25.

The square root of 28225312 is about 5312.7499470613. The cubic root of 28225312 is about 304.4712221027.

Adding to 28225312 its reverse (21352282), we get a palindrome (49577594).

The spelling of 28225312 in words is "twenty-eight million, two hundred twenty-five thousand, three hundred twelve".