28171233 has 12 divisors (see below), whose sum is σ = 42199248. Its totient is φ = 18780660.

The previous prime is 28171229. The next prime is 28171237. The reversal of 28171233 is 33217182.

It is an interprime number because it is at equal distance from previous prime (28171229) and next prime (28171237).

It is not a de Polignac number, because 28171233 - 2² = 28171229 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 28171197 and 28171206.

It is not an unprimeable number, because it can be changed into a prime (28171237) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57723 + ... + 58208.

It is an arithmetic number, because the mean of its divisors is an integer number (3516604).

Almost surely, 2^28171233 is an apocalyptic number.

It is an amenable number.

28171233 is a deficient number, since it is larger than the sum of its proper divisors (14028015).

28171233 is an equidigital number, since it uses as much as digits as its factorization.

28171233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115946 (or 115934 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 28171233 is about 5307.6579580828. The cubic root of 28171233 is about 304.2766446697.

The spelling of 28171233 in words is "twenty-eight million, one hundred seventy-one thousand, two hundred thirty-three".