1329765660 has 120 divisors (see below), whose sum is σ = 4180900416. Its totient is φ = 353808000.

The previous prime is 1329765649. The next prime is 1329765667. The reversal of 1329765660 is 665679231.

1329765660 is a `hidden beast` number, since 13 + 2 + 9 + 76 + 566 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1329765667) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1216074 + ... + 1217166.

Almost surely, 2^1329765660 is an apocalyptic number.

1329765660 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 1329765660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2090450208).

1329765660 is an abundant number, since it is smaller than the sum of its proper divisors (2851134756).

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

1329765660 is a wasteful number, since it uses less digits than its factorization.

1329765660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1865 (or 1854 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The square root of 1329765660 is about 36465.9520649057. The cubic root of 1329765660 is about 1099.6598562636.

The spelling of 1329765660 in words is "one billion, three hundred twenty-nine million, seven hundred sixty-five thousand, six hundred sixty".