28123171 has 8 divisors (see below), whose sum is σ = 29217888. Its totient is φ = 27048000.

The previous prime is 28123163. The next prime is 28123187. The reversal of 28123171 is 17132182.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28123171 - 2³ = 28123163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28127171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1920 + ... + 7741.

It is an arithmetic number, because the mean of its divisors is an integer number (3652236).

Almost surely, 2^28123171 is an apocalyptic number.

28123171 is a deficient number, since it is larger than the sum of its proper divisors (1094717).

28123171 is an equidigital number, since it uses as much as digits as its factorization.

28123171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9773.

The product of its digits is 672, while the sum is 25.

The square root of 28123171 is about 5303.1284163218. The cubic root of 28123171 is about 304.1035074299.

The spelling of 28123171 in words is "twenty-eight million, one hundred twenty-three thousand, one hundred seventy-one".