1128641857 has 16 divisors (see below), whose sum is σ = 1380787200. Its totient is φ = 900951120.

The previous prime is 1128641827. The next prime is 1128641861. The reversal of 1128641857 is 7581468211.

It is a de Polignac number, because none of the positive numbers 2^k-1128641857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1128641827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64069 + ... + 79762.

It is an arithmetic number, because the mean of its divisors is an integer number (86299200).

Almost surely, 2^1128641857 is an apocalyptic number.

It is an amenable number.

1128641857 is a deficient number, since it is larger than the sum of its proper divisors (252145343).

1128641857 is a wasteful number, since it uses less digits than its factorization.

1128641857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143916.

The product of its digits is 107520, while the sum is 43.

The square root of 1128641857 is about 33595.2653955881. The cubic root of 1128641857 is about 1041.1629794013.

The spelling of 1128641857 in words is "one billion, one hundred twenty-eight million, six hundred forty-one thousand, eight hundred fifty-seven".