28086725 has 12 divisors (see below), whose sum is σ = 34907364. Its totient is φ = 22417920.

The previous prime is 28086701. The next prime is 28086727. The reversal of 28086725 is 52768082.

It can be written as a sum of positive squares in 6 ways, for example, as 1036324 + 27050401 = 1018^2 + 5201^2 .

It is not a de Polignac number, because 28086725 - 2⁸ = 28086469 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28086727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12917 + ... + 14933.

It is an arithmetic number, because the mean of its divisors is an integer number (2908947).

Almost surely, 2^28086725 is an apocalyptic number.

28086725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28086725 is a deficient number, since it is larger than the sum of its proper divisors (6820639).

28086725 is a wasteful number, since it uses less digits than its factorization.

28086725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2584 (or 2579 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 28086725 is about 5299.6910287299. The cubic root of 28086725 is about 303.9720837997.

The spelling of 28086725 in words is "twenty-eight million, eighty-six thousand, seven hundred twenty-five".