1091840928 has 96 divisors (see below), whose sum is σ = 3029221440. Its totient is φ = 343388160.

The previous prime is 1091840927. The next prime is 1091840941. The reversal of 1091840928 is 8290481901.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×1091840928² = 2384233224111802368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1091840928.

It is not an unprimeable number, because it can be changed into a prime (1091840927) 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, 504168 + ... + 506328.

It is an arithmetic number, because the mean of its divisors is an integer number (31554390).

Almost surely, 2^1091840928 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 1091840928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1514610720).

1091840928 is an abundant number, since it is smaller than the sum of its proper divisors (1937380512).

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

1091840928 is a wasteful number, since it uses less digits than its factorization.

1091840928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2470 (or 2462 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 1091840928 is about 33043.0163272060. The cubic root of 1091840928 is about 1029.7215221014.

The spelling of 1091840928 in words is "one billion, ninety-one million, eight hundred forty thousand, nine hundred twenty-eight".