28056171 has 32 divisors (see below), whose sum is σ = 46545408. Its totient is φ = 14768640.

The previous prime is 28056143. The next prime is 28056187. The reversal of 28056171 is 17165082.

It is not a de Polignac number, because 28056171 - 2⁹ = 28055659 is a prime.

28056171 is a modest number, since divided by 6171 gives 2805 as remainder.

It is not an unprimeable number, because it can be changed into a prime (28056191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5370 + ... + 9216.

It is an arithmetic number, because the mean of its divisors is an integer number (1454544).

Almost surely, 2^28056171 is an apocalyptic number.

28056171 is a deficient number, since it is larger than the sum of its proper divisors (18489237).

28056171 is a wasteful number, since it uses less digits than its factorization.

28056171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3891.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 28056171 is about 5296.8076234653. The cubic root of 28056171 is about 303.8618189813.

The spelling of 28056171 in words is "twenty-eight million, fifty-six thousand, one hundred seventy-one".