28032871 has 4 divisors (see below), whose sum is σ = 28077112. Its totient is φ = 27988632.

The previous prime is 28032869. The next prime is 28032877. The reversal of 28032871 is 17823082.

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

It is a cyclic number.

It is not a de Polignac number, because 28032871 - 2¹ = 28032869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28032877) 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, 21156 + ... + 22441.

It is an arithmetic number, because the mean of its divisors is an integer number (7019278).

Almost surely, 2^28032871 is an apocalyptic number.

28032871 is a deficient number, since it is larger than the sum of its proper divisors (44241).

28032871 is an equidigital number, since it uses as much as digits as its factorization.

28032871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44240.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 28032871 is about 5294.6077286235. The cubic root of 28032871 is about 303.7776789513. Note that the first 3 decimals are identical.

The spelling of 28032871 in words is "twenty-eight million, thirty-two thousand, eight hundred seventy-one".