28303171 has 4 divisors (see below), whose sum is σ = 30480352. Its totient is φ = 26125992.

The previous prime is 28303139. The next prime is 28303189. The reversal of 28303171 is 17130382.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28303171 - 2⁵ = 28303139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28303771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1088571 + ... + 1088596.

It is an arithmetic number, because the mean of its divisors is an integer number (7620088).

Almost surely, 2^28303171 is an apocalyptic number.

28303171 is a deficient number, since it is larger than the sum of its proper divisors (2177181).

28303171 is a wasteful number, since it uses less digits than its factorization.

28303171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2177180.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 28303171 is about 5320.0724619125. The cubic root of 28303171 is about 304.7509244831.

The spelling of 28303171 in words is "twenty-eight million, three hundred three thousand, one hundred seventy-one".