1091794728 has 64 divisors (see below), whose sum is σ = 2852236800. Its totient is φ = 347610560.

The previous prime is 1091794727. The next prime is 1091794729. The reversal of 1091794728 is 8274971901.

It is an interprime number because it is at equal distance from previous prime (1091794727) and next prime (1091794729).

It is not an unprimeable number, because it can be changed into a prime (1091794727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 694183 + ... + 695753.

It is an arithmetic number, because the mean of its divisors is an integer number (44566200).

Almost surely, 2^1091794728 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 1091794728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1426118400).

1091794728 is an abundant number, since it is smaller than the sum of its proper divisors (1760442072).

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

1091794728 is a wasteful number, since it uses less digits than its factorization.

1091794728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2862 (or 2858 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 48.

The square root of 1091794728 is about 33042.3172310902. The cubic root of 1091794728 is about 1029.7069980671.

The spelling of 1091794728 in words is "one billion, ninety-one million, seven hundred ninety-four thousand, seven hundred twenty-eight".