28561187 has 2 divisors, whose sum is σ = 28561188. Its totient is φ = 28561186.

The previous prime is 28561153. The next prime is 28561219. The reversal of 28561187 is 78116582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28561187 - 2¹⁶ = 28495651 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28561187.

It is not a weakly prime, because it can be changed into another prime (28561387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14280593 + 14280594.

It is an arithmetic number, because the mean of its divisors is an integer number (14280594).

Almost surely, 2^28561187 is an apocalyptic number.

28561187 is a deficient number, since it is larger than the sum of its proper divisors (1).

28561187 is an equidigital number, since it uses as much as digits as its factorization.

28561187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 38.

The square root of 28561187 is about 5344.2667410974. The cubic root of 28561187 is about 305.6741765234.

The spelling of 28561187 in words is "twenty-eight million, five hundred sixty-one thousand, one hundred eighty-seven".