28045122965 has 4 divisors (see below), whose sum is σ = 33654147564. Its totient is φ = 22436098368.

The previous prime is 28045122943. The next prime is 28045122967. The reversal of 28045122965 is 56922154082.

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 3247062289 + 24798060676 = 56983^2 + 157474^2 .

It is a cyclic number.

It is not a de Polignac number, because 28045122965 - 2⁸ = 28045122709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28045122967) 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, 2804512292 + ... + 2804512301.

It is an arithmetic number, because the mean of its divisors is an integer number (8413536891).

Almost surely, 2^28045122965 is an apocalyptic number.

It is an amenable number.

28045122965 is a deficient number, since it is larger than the sum of its proper divisors (5609024599).

28045122965 is an equidigital number, since it uses as much as digits as its factorization.

28045122965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5609024598.

The product of its (nonzero) digits is 345600, while the sum is 44.

The spelling of 28045122965 in words is "twenty-eight billion, forty-five million, one hundred twenty-two thousand, nine hundred sixty-five".