28432871 has 4 divisors (see below), whose sum is σ = 28467600. Its totient is φ = 28398144.

The previous prime is 28432819. The next prime is 28432879. The reversal of 28432871 is 17823482.

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-28432871 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 (28432879) 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, 16106 + ... + 17783.

It is an arithmetic number, because the mean of its divisors is an integer number (7116900).

Almost surely, 2^28432871 is an apocalyptic number.

28432871 is a deficient number, since it is larger than the sum of its proper divisors (34729).

28432871 is an equidigital number, since it uses as much as digits as its factorization.

28432871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34728.

The product of its digits is 21504, while the sum is 35.

The square root of 28432871 is about 5332.2482125272. The cubic root of 28432871 is about 305.2157248353.

The spelling of 28432871 in words is "twenty-eight million, four hundred thirty-two thousand, eight hundred seventy-one".