28052565121 has 27 divisors (see below), whose sum is σ = 33197169987. Its totient is φ = 23636047680.

The previous prime is 28052565091. The next prime is 28052565131. The reversal of 28052565121 is 12156525082.

The square root of 28052565121 is 167489.

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., 7564650625 + 20487914496 = 86975^2 + 143136^2 .

It is not a de Polignac number, because 28052565121 - 2¹⁵ = 28052532353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28052565131) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 83241865 + ... + 83242201.

Almost surely, 2^28052565121 is an apocalyptic number.

28052565121 is the 167489-th square number.

28052565121 is the 83745-th centered octagonal number.

It is an amenable number.

28052565121 is a deficient number, since it is larger than the sum of its proper divisors (5144604866).

28052565121 is an frugal number, since it uses more digits than its factorization.

28052565121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830 (or 415 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 37.

The spelling of 28052565121 in words is "twenty-eight billion, fifty-two million, five hundred sixty-five thousand, one hundred twenty-one".