28528556311369 has 9 divisors (see below), whose sum is σ = 30305517866677. Its totient is φ = 26850320480704.

The previous prime is 28528556311357. The next prime is 28528556311417. The reversal of 28528556311369 is 96311365582582.

The square root of 28528556311369 is 5341213.

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

It can be written as a sum of positive squares in 4 ways, for example, as 236667655225 + 28291888656144 = 486485^2 + 5319012^2 .

It is not a de Polignac number, because 28528556311369 - 2⁹ = 28528556310857 is a prime.

It is a super-2 number, since 2×28528556311369² (a number of 28 digits) contains 22 as substring.

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 28528556311369.

It is not an unprimeable number, because it can be changed into a prime (28528556311319) 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, 90643527 + ... + 90957715.

Almost surely, 2^{28528556311369} is an apocalyptic number.

28528556311369 is the 5341213-rd square number.

28528556311369 is the 2670607-th centered octagonal number.

It is an amenable number.

28528556311369 is a deficient number, since it is larger than the sum of its proper divisors (1776961555308).

28528556311369 is an frugal number, since it uses more digits than its factorization.

28528556311369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628412 (or 314206 counting only the distinct ones).

The product of its digits is 93312000, while the sum is 64.

The spelling of 28528556311369 in words is "twenty-eight trillion, five hundred twenty-eight billion, five hundred fifty-six million, three hundred eleven thousand, three hundred sixty-nine".