28171671 has 8 divisors (see below), whose sum is σ = 40977024. Its totient is φ = 17073720.

The previous prime is 28171667. The next prime is 28171697. The reversal of 28171671 is 17617182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28171671 - 2² = 28171667 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 853687 = 28171671 / (2 + 8 + 1 + 7 + 1 + 6 + 7 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28171621) 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 7 ways as a sum of consecutive naturals, for example, 426811 + ... + 426876.

It is an arithmetic number, because the mean of its divisors is an integer number (5122128).

Almost surely, 2^28171671 is an apocalyptic number.

28171671 is a deficient number, since it is larger than the sum of its proper divisors (12805353).

28171671 is a wasteful number, since it uses less digits than its factorization.

28171671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853701.

The product of its digits is 4704, while the sum is 33.

The square root of 28171671 is about 5307.6992190590. The cubic root of 28171671 is about 304.2782216032.

The spelling of 28171671 in words is "twenty-eight million, one hundred seventy-one thousand, six hundred seventy-one".