28512645 has 16 divisors (see below), whose sum is σ = 52137600. Its totient is φ = 13034304.

The previous prime is 28512637. The next prime is 28512647. The reversal of 28512645 is 54621582.

It is not a de Polignac number, because 28512645 - 2³ = 28512637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28512647) 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, 135670 + ... + 135879.

It is an arithmetic number, because the mean of its divisors is an integer number (3258600).

Almost surely, 2^28512645 is an apocalyptic number.

It is an amenable number.

28512645 is a deficient number, since it is larger than the sum of its proper divisors (23624955).

28512645 is a wasteful number, since it uses less digits than its factorization.

28512645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271564.

The product of its digits is 19200, while the sum is 33.

The square root of 28512645 is about 5339.7233074383. The cubic root of 28512645 is about 305.5009058308.

The spelling of 28512645 in words is "twenty-eight million, five hundred twelve thousand, six hundred forty-five".