28512525 has 24 divisors (see below), whose sum is σ = 49193280. Its totient is φ = 14544640.

The previous prime is 28512511. The next prime is 28512541. The reversal of 28512525 is 52521582.

It is not a de Polignac number, because 28512525 - 2⁸ = 28512269 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28512492 and 28512501.

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 23 ways as a sum of consecutive naturals, for example, 6540 + ... + 9989.

It is an arithmetic number, because the mean of its divisors is an integer number (2049720).

Almost surely, 2^28512525 is an apocalyptic number.

28512525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28512525 is a deficient number, since it is larger than the sum of its proper divisors (20680755).

28512525 is a wasteful number, since it uses less digits than its factorization.

28512525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16565 (or 16560 counting only the distinct ones).

The product of its digits is 8000, while the sum is 30.

The square root of 28512525 is about 5339.7120708892. The cubic root of 28512525 is about 305.5004772472.

The spelling of 28512525 in words is "twenty-eight million, five hundred twelve thousand, five hundred twenty-five".