28128399443 has 8 divisors (see below), whose sum is σ = 28816742976. Its totient is φ = 27440164800.

The previous prime is 28128399433. The next prime is 28128399449. The reversal of 28128399443 is 34499382182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28128399443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28128399449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 797030 + ... + 831572.

It is an arithmetic number, because the mean of its divisors is an integer number (3602092872).

Almost surely, 2^28128399443 is an apocalyptic number.

28128399443 is a deficient number, since it is larger than the sum of its proper divisors (688343533).

28128399443 is a wasteful number, since it uses less digits than its factorization.

28128399443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54445.

The product of its digits is 2985984, while the sum is 53.

It can be divided in two parts, 2812839 and 9443, that added together give a palindrome (2822282).

The spelling of 28128399443 in words is "twenty-eight billion, one hundred twenty-eight million, three hundred ninety-nine thousand, four hundred forty-three".