1121776728 has 64 divisors (see below), whose sum is σ = 2883777120. Its totient is φ = 363417600.

The previous prime is 1121776727. The next prime is 1121776751. The reversal of 1121776728 is 8276771211.

It is a self number, because there is not a number n which added to its sum of digits gives 1121776728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121776727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274476 + ... + 278532.

Almost surely, 2^1121776728 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 1121776728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1441888560).

1121776728 is an abundant number, since it is smaller than the sum of its proper divisors (1762000392).

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

1121776728 is a wasteful number, since it uses less digits than its factorization.

1121776728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4388 (or 4384 counting only the distinct ones).

The product of its digits is 65856, while the sum is 42.

The square root of 1121776728 is about 33492.9354939217. The cubic root of 1121776728 is about 1039.0476760572.

The spelling of 1121776728 in words is "one billion, one hundred twenty-one million, seven hundred seventy-six thousand, seven hundred twenty-eight".