2128784445 has 24 divisors (see below), whose sum is σ = 3775707936. Its totient is φ = 1108947168.

The previous prime is 2128784443. The next prime is 2128784461. The reversal of 2128784445 is 5444878212.

2128784445 is a `hidden beast` number, since 2 + 128 + 7 + 84 + 445 = 666.

It is not a de Polignac number, because 2128784445 - 2¹ = 2128784443 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2128784445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2128784443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 548139 + ... + 552008.

It is an arithmetic number, because the mean of its divisors is an integer number (157321164).

Almost surely, 2^2128784445 is an apocalyptic number.

It is an amenable number.

2128784445 is a deficient number, since it is larger than the sum of its proper divisors (1646923491).

2128784445 is a wasteful number, since it uses less digits than its factorization.

2128784445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100201 (or 1100198 counting only the distinct ones).

The product of its digits is 573440, while the sum is 45.

The square root of 2128784445 is about 46138.7520962585. The cubic root of 2128784445 is about 1286.4035484936.

The spelling of 2128784445 in words is "two billion, one hundred twenty-eight million, seven hundred eighty-four thousand, four hundred forty-five".