28056187 has 2 divisors, whose sum is σ = 28056188.
Its totient is φ = 28056186.
The previous prime is 28056143. The next prime is 28056191. The reversal of 28056187 is 78165082.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 28056187 - 215 = 28023419 is a prime.
It is not a weakly prime, because it can be changed into another prime (28036187) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14028093 + 14028094.
It is an arithmetic number, because the mean of its divisors is an integer number (14028094).
Almost surely, 228056187 is an apocalyptic number.
28056187 is a deficient number, since it is larger than the sum of its proper divisors (1).
28056187 is an equidigital number, since it uses as much as digits as its factorization.
28056187 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 26880, while the sum is 37.
The square root of 28056187 is about 5296.8091338088.
The cubic root of 28056187 is about 303.8618767438.
It can be divided in two parts, 2805618 and 7, that added together give a square (2805625 = 16752).
The spelling of 28056187 in words is "twenty-eight million, fifty-six thousand, one hundred eighty-seven".