28287525 has 24 divisors (see below), whose sum is σ = 53450944. Its totient is φ = 12931200.

The previous prime is 28287521. The next prime is 28287527. The reversal of 28287525 is 52578282.

It is a happy number.

It is not a de Polignac number, because 28287525 - 2² = 28287521 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28287521) 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 23 ways as a sum of consecutive naturals, for example, 26416 + ... + 27465.

Almost surely, 2^28287525 is an apocalyptic number.

28287525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28287525 is a deficient number, since it is larger than the sum of its proper divisors (25163419).

28287525 is a wasteful number, since it uses less digits than its factorization.

28287525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53901 (or 53896 counting only the distinct ones).

The product of its digits is 89600, while the sum is 39.

The square root of 28287525 is about 5318.6017899444. The cubic root of 28287525 is about 304.6947586699.

The spelling of 28287525 in words is "twenty-eight million, two hundred eighty-seven thousand, five hundred twenty-five".