28085725 has 6 divisors (see below), whose sum is σ = 34826330. Its totient is φ = 22468560.

The previous prime is 28085723. The next prime is 28085749. The reversal of 28085725 is 52758082.

It can be written as a sum of positive squares in 3 ways, for example, as 7601049 + 20484676 = 2757^2 + 4526^2 .

It is not a de Polignac number, because 28085725 - 2¹ = 28085723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28085723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 561690 + ... + 561739.

Almost surely, 2^28085725 is an apocalyptic number.

28085725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28085725 is a deficient number, since it is larger than the sum of its proper divisors (6740605).

28085725 is a wasteful number, since it uses less digits than its factorization.

28085725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123439 (or 1123434 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 37.

The square root of 28085725 is about 5299.5966827675. The cubic root of 28085725 is about 303.9684762153.

The spelling of 28085725 in words is "twenty-eight million, eighty-five thousand, seven hundred twenty-five".