1128781104 has 80 divisors (see below), whose sum is σ = 3189498240. Its totient is φ = 341153280.

The previous prime is 1128781063. The next prime is 1128781111. The reversal of 1128781104 is 4011878211.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213339 + ... + 218565.

It is an arithmetic number, because the mean of its divisors is an integer number (39868728).

Almost surely, 2^1128781104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1128781104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1594749120).

1128781104 is an abundant number, since it is smaller than the sum of its proper divisors (2060717136).

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

1128781104 is a wasteful number, since it uses less digits than its factorization.

1128781104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5658 (or 5652 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 33.

The square root of 1128781104 is about 33597.3377516731. The cubic root of 1128781104 is about 1041.2057957174.

The spelling of 1128781104 in words is "one billion, one hundred twenty-eight million, seven hundred eighty-one thousand, one hundred four".