28140187 has 2 divisors, whose sum is σ = 28140188. Its totient is φ = 28140186.

The previous prime is 28140143. The next prime is 28140199. The reversal of 28140187 is 78104182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28140187 - 2⁷ = 28140059 is a prime.

It is not a weakly prime, because it can be changed into another prime (28140137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14070093 + 14070094.

It is an arithmetic number, because the mean of its divisors is an integer number (14070094).

Almost surely, 2^28140187 is an apocalyptic number.

28140187 is a deficient number, since it is larger than the sum of its proper divisors (1).

28140187 is an equidigital number, since it uses as much as digits as its factorization.

28140187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 28140187 is about 5304.7325097501. The cubic root of 28140187 is about 304.1648279449.

The spelling of 28140187 in words is "twenty-eight million, one hundred forty thousand, one hundred eighty-seven".