28125612 has 36 divisors (see below), whose sum is σ = 72752680. Its totient is φ = 9156672.

The previous prime is 28125611. The next prime is 28125623. The reversal of 28125612 is 21652182.

It is a happy number.

28125612 is a `hidden beast` number, since 28 + 1 + 25 + 612 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (28125611) 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 11 ways as a sum of consecutive naturals, for example, 7537 + ... + 10632.

Almost surely, 2^28125612 is an apocalyptic number.

It is an amenable number.

28125612 is an abundant number, since it is smaller than the sum of its proper divisors (44627068).

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

28125612 is a wasteful number, since it uses less digits than its factorization.

28125612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18222 (or 18217 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 28125612 is about 5303.3585584986. The cubic root of 28125612 is about 304.1123055746.

Adding to 28125612 its reverse (21652182), we get a palindrome (49777794).

The spelling of 28125612 in words is "twenty-eight million, one hundred twenty-five thousand, six hundred twelve".