28109047 has 2 divisors, whose sum is σ = 28109048. Its totient is φ = 28109046.

The previous prime is 28109023. The next prime is 28109051. The reversal of 28109047 is 74090182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28109047 - 2⁷ = 28108919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28109077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14054523 + 14054524.

It is an arithmetic number, because the mean of its divisors is an integer number (14054524).

Almost surely, 2^28109047 is an apocalyptic number.

28109047 is a deficient number, since it is larger than the sum of its proper divisors (1).

28109047 is an equidigital number, since it uses as much as digits as its factorization.

28109047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 28109047 is about 5301.7965822917. The cubic root of 28109047 is about 304.0525900188.

The spelling of 28109047 in words is "twenty-eight million, one hundred nine thousand, forty-seven".