1320339280 has 80 divisors (see below), whose sum is σ = 3311819280. Its totient is φ = 486641664.

The previous prime is 1320339269. The next prime is 1320339313. The reversal of 1320339280 is 829330231.

It can be written as a sum of positive squares in 8 ways, for example, as 171400464 + 1148938816 = 13092^2 + 33896^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1073706 + ... + 1074934.

It is an arithmetic number, because the mean of its divisors is an integer number (41397741).

Almost surely, 2^1320339280 is an apocalyptic number.

1320339280 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 1320339280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1655909640).

1320339280 is an abundant number, since it is smaller than the sum of its proper divisors (1991480000).

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

1320339280 is a wasteful number, since it uses less digits than its factorization.

1320339280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2288 (or 2282 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 1320339280 is about 36336.4731365057. The cubic root of 1320339280 is about 1097.0552865348.

The spelling of 1320339280 in words is "one billion, three hundred twenty million, three hundred thirty-nine thousand, two hundred eighty".