28304361121 has 9 divisors (see below), whose sum is σ = 29096418099. Its totient is φ = 27533321784.

The previous prime is 28304361119. The next prime is 28304361139. The reversal of 28304361121 is 12116340382.

The square root of 28304361121 is 168239.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 25327131025 + 2977230096 = 159145^2 + 54564^2 .

It is not a de Polignac number, because 28304361121 - 2¹ = 28304361119 is a prime.

It is a super-2 number, since 2×28304361121² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23304361121) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6222570 + ... + 6227116.

Almost surely, 2^28304361121 is an apocalyptic number.

28304361121 is the 168239-th square number.

28304361121 is the 84120-th centered octagonal number.

It is an amenable number.

28304361121 is a deficient number, since it is larger than the sum of its proper divisors (792056978).

28304361121 is an frugal number, since it uses more digits than its factorization.

28304361121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9168 (or 4584 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The spelling of 28304361121 in words is "twenty-eight billion, three hundred four million, three hundred sixty-one thousand, one hundred twenty-one".