1091918828 has 192 divisors, whose sum is σ = 2793799680. Its totient is φ = 359251200.

The previous prime is 1091918819. The next prime is 1091918833. The reversal of 1091918828 is 8288191901.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2358125 + ... + 2358587.

It is an arithmetic number, because the mean of its divisors is an integer number (14551040).

Almost surely, 2^1091918828 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 1091918828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1396899840).

1091918828 is an abundant number, since it is smaller than the sum of its proper divisors (1701880852).

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

1091918828 is a wasteful number, since it uses less digits than its factorization.

1091918828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548 (or 546 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 47.

The square root of 1091918828 is about 33044.1950726599. The cubic root of 1091918828 is about 1029.7460108332.

It can be divided in two parts, 1091 and 918828, that added together give a palindrome (919919).

The spelling of 1091918828 in words is "one billion, ninety-one million, nine hundred eighteen thousand, eight hundred twenty-eight".