28525187 has 4 divisors (see below), whose sum is σ = 29296176. Its totient is φ = 27754200.

The previous prime is 28525157. The next prime is 28525219. The reversal of 28525187 is 78152582.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78152582 = 2 ⋅39076291.

It is a cyclic number.

It is not a de Polignac number, because 28525187 - 2⁸ = 28524931 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28525187.

It is not an unprimeable number, because it can be changed into a prime (28525117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385439 + ... + 385512.

It is an arithmetic number, because the mean of its divisors is an integer number (7324044).

Almost surely, 2^28525187 is an apocalyptic number.

28525187 is a deficient number, since it is larger than the sum of its proper divisors (770989).

28525187 is an equidigital number, since it uses as much as digits as its factorization.

28525187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770988.

The product of its digits is 44800, while the sum is 38.

The square root of 28525187 is about 5340.8975837400. The cubic root of 28525187 is about 305.5456933358.

The spelling of 28525187 in words is "twenty-eight million, five hundred twenty-five thousand, one hundred eighty-seven".