1128783811 has 16 divisors (see below), whose sum is σ = 1236510720. Its totient is φ = 1027128960.

The previous prime is 1128783779. The next prime is 1128783829. The reversal of 1128783811 is 1183878211.

It is a cyclic number.

It is not a de Polignac number, because 1128783811 - 2⁵ = 1128783779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1128783871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28651 + ... + 55483.

It is an arithmetic number, because the mean of its divisors is an integer number (77281920).

Almost surely, 2^1128783811 is an apocalyptic number.

1128783811 is a deficient number, since it is larger than the sum of its proper divisors (107726909).

1128783811 is a wasteful number, since it uses less digits than its factorization.

1128783811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26946.

The product of its digits is 21504, while the sum is 40.

The square root of 1128783811 is about 33597.3780375791. The cubic root of 1128783811 is about 1041.2066280434.

The spelling of 1128783811 in words is "one billion, one hundred twenty-eight million, seven hundred eighty-three thousand, eight hundred eleven".