1128720042 has 64 divisors (see below), whose sum is σ = 2651904000. Its totient is φ = 354869424.

The previous prime is 1128720031. The next prime is 1128720077. The reversal of 1128720042 is 2400278211.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1128719988 and 1128720015.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 242913 + ... + 247515.

It is an arithmetic number, because the mean of its divisors is an integer number (41436000).

Almost surely, 2^1128720042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1128720042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1325952000).

1128720042 is an abundant number, since it is smaller than the sum of its proper divisors (1523183958).

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

1128720042 is a wasteful number, since it uses less digits than its factorization.

1128720042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4872 (or 4866 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 1128720042 is about 33596.4290066668. The cubic root of 1128720042 is about 1041.1870205227.

Adding to 1128720042 its reverse (2400278211), we get a palindrome (3528998253).

It can be divided in two parts, 11287 and 20042, that added together give a square (31329 = 177²).

The spelling of 1128720042 in words is "one billion, one hundred twenty-eight million, seven hundred twenty thousand, forty-two".