28372884643 has 4 divisors (see below), whose sum is σ = 28373283400. Its totient is φ = 28372485888.

The previous prime is 28372884619. The next prime is 28372884647. The reversal of 28372884643 is 34648827382.

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

It is a cyclic number.

It is not a de Polignac number, because 28372884643 - 2⁵ = 28372884611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28372884647) 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, 60318 + ... + 245731.

It is an arithmetic number, because the mean of its divisors is an integer number (7093320850).

Almost surely, 2^28372884643 is an apocalyptic number.

28372884643 is a deficient number, since it is larger than the sum of its proper divisors (398757).

28372884643 is an equidigital number, since it uses as much as digits as its factorization.

28372884643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398756.

The product of its digits is 12386304, while the sum is 55.

The spelling of 28372884643 in words is "twenty-eight billion, three hundred seventy-two million, eight hundred eighty-four thousand, six hundred forty-three".