1091020480 has 112 divisors (see below), whose sum is σ = 2911120416. Its totient is φ = 385966080.

The previous prime is 1091020477. The next prime is 1091020481. The reversal of 1091020480 is 840201901.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1091020481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126052 + ... + 134428.

Almost surely, 2^1091020480 is an apocalyptic number.

1091020480 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 1091020480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1455560208).

1091020480 is an abundant number, since it is smaller than the sum of its proper divisors (1820099936).

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

1091020480 is a wasteful number, since it uses less digits than its factorization.

1091020480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8442 (or 8432 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1091020480 is about 33030.5991468517. The cubic root of 1091020480 is about 1029.4635343786.

The spelling of 1091020480 in words is "one billion, ninety-one million, twenty thousand, four hundred eighty".