28212171 has 16 divisors (see below), whose sum is σ = 41454336. Its totient is φ = 16956576.

The previous prime is 28212127. The next prime is 28212179. The reversal of 28212171 is 17121282.

It is not a de Polignac number, because 28212171 - 2⁷ = 28212043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28212179) 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 15 ways as a sum of consecutive naturals, for example, 6735 + ... + 10088.

It is an arithmetic number, because the mean of its divisors is an integer number (2590896).

Almost surely, 2^28212171 is an apocalyptic number.

28212171 is a deficient number, since it is larger than the sum of its proper divisors (13242165).

28212171 is a wasteful number, since it uses less digits than its factorization.

28212171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16882.

The product of its digits is 448, while the sum is 24.

The square root of 28212171 is about 5311.5130612661. The cubic root of 28212171 is about 304.4239633700.

The spelling of 28212171 in words is "twenty-eight million, two hundred twelve thousand, one hundred seventy-one".