28432172827 has 4 divisors (see below), whose sum is σ = 28511371440. Its totient is φ = 28352974216.

The previous prime is 28432172749. The next prime is 28432172833. The reversal of 28432172827 is 72827123482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72827123482 = 2 ⋅36413561741.

It is a cyclic number.

It is not a de Polignac number, because 28432172827 - 2²⁷ = 28297955099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28432176827) 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, 39598768 + ... + 39599485.

It is an arithmetic number, because the mean of its divisors is an integer number (7127842860).

Almost surely, 2^28432172827 is an apocalyptic number.

28432172827 is a deficient number, since it is larger than the sum of its proper divisors (79198613).

28432172827 is an equidigital number, since it uses as much as digits as its factorization.

28432172827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79198612.

The product of its digits is 602112, while the sum is 46.

The spelling of 28432172827 in words is "twenty-eight billion, four hundred thirty-two million, one hundred seventy-two thousand, eight hundred twenty-seven".