1320880380 has 96 divisors (see below), whose sum is σ = 3915475200. Its totient is φ = 331780608.

The previous prime is 1320880373. The next prime is 1320880403. The reversal of 1320880380 is 830880231.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 200824 + ... + 207296.

It is an arithmetic number, because the mean of its divisors is an integer number (40786200).

Almost surely, 2^1320880380 is an apocalyptic number.

1320880380 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 1320880380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1957737600).

1320880380 is an abundant number, since it is smaller than the sum of its proper divisors (2594594820).

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

1320880380 is a wasteful number, since it uses less digits than its factorization.

1320880380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6683 (or 6681 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 1320880380 is about 36343.9180606604. The cubic root of 1320880380 is about 1097.2051307330.

The spelling of 1320880380 in words is "one billion, three hundred twenty million, eight hundred eighty thousand, three hundred eighty".