28333864505 has 4 divisors (see below), whose sum is σ = 34000637412. Its totient is φ = 22667091600.

The previous prime is 28333864451. The next prime is 28333864541. The reversal of 28333864505 is 50546833382.

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 5618551849 + 22715312656 = 74957^2 + 150716^2 .

It is not a de Polignac number, because 28333864505 - 2¹⁴ = 28333848121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28333864505.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2833386446 + ... + 2833386455.

It is an arithmetic number, because the mean of its divisors is an integer number (8500159353).

Almost surely, 2^28333864505 is an apocalyptic number.

It is an amenable number.

28333864505 is a deficient number, since it is larger than the sum of its proper divisors (5666772907).

28333864505 is an equidigital number, since it uses as much as digits as its factorization.

28333864505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5666772906.

The product of its (nonzero) digits is 2073600, while the sum is 47.

The spelling of 28333864505 in words is "twenty-eight billion, three hundred thirty-three million, eight hundred sixty-four thousand, five hundred five".