28187123 has 2 divisors, whose sum is σ = 28187124. Its totient is φ = 28187122.

The previous prime is 28187113. The next prime is 28187129. The reversal of 28187123 is 32178182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28187123 - 2¹⁴ = 28170739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28187123.

It is not a weakly prime, because it can be changed into another prime (28187129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14093561 + 14093562.

It is an arithmetic number, because the mean of its divisors is an integer number (14093562).

Almost surely, 2^28187123 is an apocalyptic number.

28187123 is a deficient number, since it is larger than the sum of its proper divisors (1).

28187123 is an equidigital number, since it uses as much as digits as its factorization.

28187123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 32.

The square root of 28187123 is about 5309.1546408068. The cubic root of 28187123 is about 304.3338430550. Note that the first 3 decimals are identical.

The spelling of 28187123 in words is "twenty-eight million, one hundred eighty-seven thousand, one hundred twenty-three".