28525869 has 6 divisors (see below), whose sum is σ = 41204046. Its totient is φ = 19017240.

The previous prime is 28525867. The next prime is 28525877. The reversal of 28525869 is 96852582.

It can be written as a sum of positive squares in only one way, i.e., 27688644 + 837225 = 5262^2 + 915^2 .

It is not a de Polignac number, because 28525869 - 2¹ = 28525867 is a prime.

It is a super-2 number, since 2×28525869² = 1627450404410322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28525867) 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 5 ways as a sum of consecutive naturals, for example, 1584762 + ... + 1584779.

It is an arithmetic number, because the mean of its divisors is an integer number (6867341).

Almost surely, 2^28525869 is an apocalyptic number.

It is an amenable number.

28525869 is a deficient number, since it is larger than the sum of its proper divisors (12678177).

28525869 is a wasteful number, since it uses less digits than its factorization.

28525869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3169547 (or 3169544 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 28525869 is about 5340.9614303045. The cubic root of 28525869 is about 305.5481283827.

The spelling of 28525869 in words is "twenty-eight million, five hundred twenty-five thousand, eight hundred sixty-nine".