28256525 has 18 divisors (see below), whose sum is σ = 38517066. Its totient is φ = 20548000.

The previous prime is 28256507. The next prime is 28256549. The reversal of 28256525 is 52565282.

It can be written as a sum of positive squares in 3 ways, for example, as 609961 + 27646564 = 781^2 + 5258^2 .

It is not a de Polignac number, because 28256525 - 2⁸ = 28256269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 1646 + ... + 7695.

It is an arithmetic number, because the mean of its divisors is an integer number (2139837).

Almost surely, 2^28256525 is an apocalyptic number.

28256525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28256525 is a deficient number, since it is larger than the sum of its proper divisors (10260541).

28256525 is a wasteful number, since it uses less digits than its factorization.

28256525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9373 (or 9357 counting only the distinct ones).

The product of its digits is 48000, while the sum is 35.

The square root of 28256525 is about 5315.6866912940. The cubic root of 28256525 is about 304.5834140632.

The spelling of 28256525 in words is "twenty-eight million, two hundred fifty-six thousand, five hundred twenty-five".