28171871 has 16 divisors (see below), whose sum is σ = 34810944. Its totient is φ = 22201344.

The previous prime is 28171867. The next prime is 28171883. The reversal of 28171871 is 17817182.

It is a cyclic number.

It is not a de Polignac number, because 28171871 - 2² = 28171867 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28171841) 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, 31685 + ... + 32561.

It is an arithmetic number, because the mean of its divisors is an integer number (2175684).

Almost surely, 2^28171871 is an apocalyptic number.

28171871 is a deficient number, since it is larger than the sum of its proper divisors (6639073).

28171871 is a wasteful number, since it uses less digits than its factorization.

28171871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250.

The product of its digits is 6272, while the sum is 35.

The square root of 28171871 is about 5307.7180595808. The cubic root of 28171871 is about 304.2789416587.

The spelling of 28171871 in words is "twenty-eight million, one hundred seventy-one thousand, eight hundred seventy-one".