1128257188 has 24 divisors (see below), whose sum is σ = 2028441240. Its totient is φ = 548782080.

The previous prime is 1128257171. The next prime is 1128257189. The reversal of 1128257188 is 8817528211.

It can be written as a sum of positive squares in 4 ways, for example, as 76422564 + 1051834624 = 8742^2 + 32432^2 .

It is not an unprimeable number, because it can be changed into a prime (1128257189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48148 + ... + 67636.

It is an arithmetic number, because the mean of its divisors is an integer number (84518385).

Almost surely, 2^1128257188 is an apocalyptic number.

It is an amenable number.

1128257188 is a deficient number, since it is larger than the sum of its proper divisors (900184052).

1128257188 is a wasteful number, since it uses less digits than its factorization.

1128257188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19887 (or 19885 counting only the distinct ones).

The product of its digits is 71680, while the sum is 43.

The square root of 1128257188 is about 33589.5398599028. The cubic root of 1128257188 is about 1041.0446812808.

The spelling of 1128257188 in words is "one billion, one hundred twenty-eight million, two hundred fifty-seven thousand, one hundred eighty-eight".