1091480320 has 144 divisors (see below), whose sum is σ = 3038430528. Its totient is φ = 367902720.

The previous prime is 1091480303. The next prime is 1091480321. The reversal of 1091480320 is 230841901.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (1091480321) 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, 545562 + ... + 547558.

It is an arithmetic number, because the mean of its divisors is an integer number (21100212).

Almost surely, 2^1091480320 is an apocalyptic number.

1091480320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1091480320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1519215264).

1091480320 is an abundant number, since it is smaller than the sum of its proper divisors (1946950208).

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

1091480320 is an equidigital number, since it uses as much as digits as its factorization.

1091480320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2086 (or 2072 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1091480320 is about 33037.5592318803. The cubic root of 1091480320 is about 1029.6081457855.

The spelling of 1091480320 in words is "one billion, ninety-one million, four hundred eighty thousand, three hundred twenty".