28521525 has 12 divisors (see below), whose sum is σ = 47155712. Its totient is φ = 15211440.

The previous prime is 28521523. The next prime is 28521547. The reversal of 28521525 is 52512582.

It is not a de Polignac number, because 28521525 - 2¹ = 28521523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28521492 and 28521501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28521523) 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, 190069 + ... + 190218.

Almost surely, 2^28521525 is an apocalyptic number.

28521525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28521525 is a deficient number, since it is larger than the sum of its proper divisors (18634187).

28521525 is a wasteful number, since it uses less digits than its factorization.

28521525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380300 (or 380295 counting only the distinct ones).

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

The square root of 28521525 is about 5340.5547464660. The cubic root of 28521525 is about 305.5326176843.

The spelling of 28521525 in words is "twenty-eight million, five hundred twenty-one thousand, five hundred twenty-five".