28125212 has 12 divisors (see below), whose sum is σ = 49362600. Its totient is φ = 14021616.

The previous prime is 28125203. The next prime is 28125233. The reversal of 28125212 is 21252182.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 8678 + ... + 11469.

It is an arithmetic number, because the mean of its divisors is an integer number (4113550).

Almost surely, 2^28125212 is an apocalyptic number.

It is an amenable number.

28125212 is a deficient number, since it is larger than the sum of its proper divisors (21237388).

28125212 is a wasteful number, since it uses less digits than its factorization.

28125212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20500 (or 20498 counting only the distinct ones).

The product of its digits is 640, while the sum is 23.

The square root of 28125212 is about 5303.3208464131. The cubic root of 28125212 is about 304.1108638815.

Adding to 28125212 its reverse (21252182), we get a palindrome (49377394).

The spelling of 28125212 in words is "twenty-eight million, one hundred twenty-five thousand, two hundred twelve".