1128642988 has 72 divisors (see below), whose sum is σ = 2312604000. Its totient is φ = 479930880.

The previous prime is 1128642979. The next prime is 1128642989. The reversal of 1128642988 is 8892468211.

It is not an unprimeable number, because it can be changed into a prime (1128642989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1883913 + ... + 1884511.

It is an arithmetic number, because the mean of its divisors is an integer number (32119500).

Almost surely, 2^1128642988 is an apocalyptic number.

It is an amenable number.

1128642988 is an abundant number, since it is smaller than the sum of its proper divisors (1183961012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1128642988 is a wasteful number, since it uses less digits than its factorization.

1128642988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871 (or 858 counting only the distinct ones).

The product of its digits is 442368, while the sum is 49.

The square root of 1128642988 is about 33595.2822283130. The cubic root of 1128642988 is about 1041.1633271806.

The spelling of 1128642988 in words is "one billion, one hundred twenty-eight million, six hundred forty-two thousand, nine hundred eighty-eight".