28809120722 has 18 divisors (see below), whose sum is σ = 43475576997. Its totient is φ = 14317786624.

The previous prime is 28809120689. The next prime is 28809120751. The reversal of 28809120722 is 22702190882.

It can be written as a sum of positive squares in 2 ways, for example, as 17963772841 + 10845347881 = 134029^2 + 104141^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=120019.

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 28809120722.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 61689533 + ... + 61689999.

Almost surely, 2^28809120722 is an apocalyptic number.

28809120722 is a deficient number, since it is larger than the sum of its proper divisors (14666456275).

28809120722 is an frugal number, since it uses more digits than its factorization.

28809120722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450 (or 726 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 41.

The spelling of 28809120722 in words is "twenty-eight billion, eight hundred nine million, one hundred twenty thousand, seven hundred twenty-two".