2028735889569 has 9 divisors (see below), whose sum is σ = 2930402457073. Its totient is φ = 1352487744372.

The previous prime is 2028735889549. The next prime is 2028735889627. The reversal of 2028735889569 is 9659885378202.

The square root of 2028735889569 is 1424337.

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

2028735889569 is a `hidden beast` number, since 2 + 0 + 2 + 8 + 7 + 3 + 58 + 8 + 9 + 569 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is a de Polignac number, because none of the positive numbers 2^k-2028735889569 is a prime.

It is a super-2 number, since 2×2028735889569² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2028735889497 and 2028735889506.

It is not an unprimeable number, because it can be changed into a prime (2028735889549) 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, 4035622 + ... + 4510400.

Almost surely, 2^{2028735889569} is an apocalyptic number.

2028735889569 is the 1424337-th square number.

2028735889569 is the 712169-th centered octagonal number.

It is an amenable number.

2028735889569 is a deficient number, since it is larger than the sum of its proper divisors (901666567504).

2028735889569 is an frugal number, since it uses more digits than its factorization.

2028735889569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949564 (or 474782 counting only the distinct ones).

The product of its (nonzero) digits is 522547200, while the sum is 72.

The spelling of 2028735889569 in words is "two trillion, twenty-eight billion, seven hundred thirty-five million, eight hundred eighty-nine thousand, five hundred sixty-nine".