28071187 has 2 divisors, whose sum is σ = 28071188. Its totient is φ = 28071186.

The previous prime is 28071119. The next prime is 28071193. The reversal of 28071187 is 78117082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28071187 - 2⁷ = 28071059 is a prime.

It is not a weakly prime, because it can be changed into another prime (28071107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14035593 + 14035594.

It is an arithmetic number, because the mean of its divisors is an integer number (14035594).

Almost surely, 2^28071187 is an apocalyptic number.

28071187 is a deficient number, since it is larger than the sum of its proper divisors (1).

28071187 is an equidigital number, since it uses as much as digits as its factorization.

28071187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6272, while the sum is 34.

The square root of 28071187 is about 5298.2248914141. The cubic root of 28071187 is about 303.9160194790.

The spelling of 28071187 in words is "twenty-eight million, seventy-one thousand, one hundred eighty-seven".