1329808820 has 12 divisors (see below), whose sum is σ = 2792598564. Its totient is φ = 531923520.

The previous prime is 1329808813. The next prime is 1329808859. The reversal of 1329808820 is 288089231.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 597998116 + 731810704 = 24454^2 + 27052^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33245201 + ... + 33245240.

It is an arithmetic number, because the mean of its divisors is an integer number (232716547).

Almost surely, 2^1329808820 is an apocalyptic number.

1329808820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1329808820 is an abundant number, since it is smaller than the sum of its proper divisors (1462789744).

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

1329808820 is a wasteful number, since it uses less digits than its factorization.

1329808820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66490450 (or 66490448 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 1329808820 is about 36466.5438450095. The cubic root of 1329808820 is about 1099.6717532986.

The spelling of 1329808820 in words is "one billion, three hundred twenty-nine million, eight hundred eight thousand, eight hundred twenty".