28232171 has 4 divisors (see below), whose sum is σ = 30798744. Its totient is φ = 25665600.

The previous prime is 28232161. The next prime is 28232173. The reversal of 28232171 is 17123282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28232171 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28232171.

It is not an unprimeable number, because it can be changed into a prime (28232173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1283270 + ... + 1283291.

It is an arithmetic number, because the mean of its divisors is an integer number (7699686).

Almost surely, 2^28232171 is an apocalyptic number.

28232171 is a deficient number, since it is larger than the sum of its proper divisors (2566573).

28232171 is a wasteful number, since it uses less digits than its factorization.

28232171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2566572.

The product of its digits is 1344, while the sum is 26.

The square root of 28232171 is about 5313.3954304192. The cubic root of 28232171 is about 304.4958831701.

Subtracting from 28232171 its reverse (17123282), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 2823 and 2171, that added together give a palindrome (4994).

The spelling of 28232171 in words is "twenty-eight million, two hundred thirty-two thousand, one hundred seventy-one".