28289840533 has 4 divisors (see below), whose sum is σ = 28298604940. Its totient is φ = 28281076128.

The previous prime is 28289840507. The next prime is 28289840569. The reversal of 28289840533 is 33504898282.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12013694449 + 16276146084 = 109607^2 + 127578^2 .

It is a cyclic number.

It is not a de Polignac number, because 28289840533 - 2¹³ = 28289832341 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 (28289840503) 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, 4377360 + ... + 4383817.

It is an arithmetic number, because the mean of its divisors is an integer number (7074651235).

Almost surely, 2^28289840533 is an apocalyptic number.

It is an amenable number.

28289840533 is a deficient number, since it is larger than the sum of its proper divisors (8764407).

28289840533 is an equidigital number, since it uses as much as digits as its factorization.

28289840533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8764406.

The product of its (nonzero) digits is 3317760, while the sum is 52.

The spelling of 28289840533 in words is "twenty-eight billion, two hundred eighty-nine million, eight hundred forty thousand, five hundred thirty-three".