28202816945 has 16 divisors (see below), whose sum is σ = 34602674688. Its totient is φ = 22057147200.

The previous prime is 28202816923. The next prime is 28202816947. The reversal of 28202816945 is 54961820282.

It is not a de Polignac number, because 28202816945 - 2¹⁸ = 28202554801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

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 28202816945.

It is not an unprimeable number, because it can be changed into a prime (28202816947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140795 + ... + 276095.

It is an arithmetic number, because the mean of its divisors is an integer number (2162667168).

Almost surely, 2^28202816945 is an apocalyptic number.

It is an amenable number.

28202816945 is a deficient number, since it is larger than the sum of its proper divisors (6399857743).

28202816945 is a wasteful number, since it uses less digits than its factorization.

28202816945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136240.

The product of its (nonzero) digits is 552960, while the sum is 47.

The spelling of 28202816945 in words is "twenty-eight billion, two hundred two million, eight hundred sixteen thousand, nine hundred forty-five".