28638171 has 8 divisors (see below), whose sum is σ = 42426960. Its totient is φ = 19092096.

The previous prime is 28638157. The next prime is 28638173. The reversal of 28638171 is 17183682.

28638171 is a `hidden beast` number, since 2 + 8 + 638 + 17 + 1 = 666.

It is not a de Polignac number, because 28638171 - 2⁵ = 28638139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28638173) 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, 530310 + ... + 530363.

It is an arithmetic number, because the mean of its divisors is an integer number (5303370).

Almost surely, 2^28638171 is an apocalyptic number.

28638171 is a deficient number, since it is larger than the sum of its proper divisors (13788789).

28638171 is a wasteful number, since it uses less digits than its factorization.

28638171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060682 (or 1060676 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 28638171 is about 5351.4643790275. The cubic root of 28638171 is about 305.9485688264.

The spelling of 28638171 in words is "twenty-eight million, six hundred thirty-eight thousand, one hundred seventy-one".