28166271 has 16 divisors (see below), whose sum is σ = 43198464. Its totient is φ = 15990624.

The previous prime is 28166269. The next prime is 28166291. The reversal of 28166271 is 17266182.

It is not a de Polignac number, because 28166271 - 2¹ = 28166269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28166291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 975 + ... + 7568.

It is an arithmetic number, because the mean of its divisors is an integer number (2699904).

Almost surely, 2^28166271 is an apocalyptic number.

28166271 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28166271 is a deficient number, since it is larger than the sum of its proper divisors (15032193).

28166271 is a wasteful number, since it uses less digits than its factorization.

28166271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8710.

The product of its digits is 8064, while the sum is 33.

The square root of 28166271 is about 5307.1904996900. The cubic root of 28166271 is about 304.2587788162.

The spelling of 28166271 in words is "twenty-eight million, one hundred sixty-six thousand, two hundred seventy-one".