28531457671 has 4 divisors (see below), whose sum is σ = 28539133200. Its totient is φ = 28523782144.

The previous prime is 28531457587. The next prime is 28531457681. The reversal of 28531457671 is 17675413582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17675413582 = 2 ⋅8837706791.

It is a cyclic number.

It is not a de Polignac number, because 28531457671 - 2²³ = 28523069063 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 (28531457681) 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, 3832186 + ... + 3839623.

It is an arithmetic number, because the mean of its divisors is an integer number (7134783300).

Almost surely, 2^28531457671 is an apocalyptic number.

28531457671 is a deficient number, since it is larger than the sum of its proper divisors (7675529).

28531457671 is an equidigital number, since it uses as much as digits as its factorization.

28531457671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7675528.

The product of its digits is 1411200, while the sum is 49.

The spelling of 28531457671 in words is "twenty-eight billion, five hundred thirty-one million, four hundred fifty-seven thousand, six hundred seventy-one".