1329785856 has 176 divisors, whose sum is σ = 4501434880. Its totient is φ = 379883520.

The previous prime is 1329785839. The next prime is 1329785861. The reversal of 1329785856 is 6585879231.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 190101 + ... + 196971.

Almost surely, 2^1329785856 is an apocalyptic number.

1329785856 is a gapful number since it is divisible by the number (16) 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 1329785856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2250717440).

1329785856 is an abundant number, since it is smaller than the sum of its proper divisors (3171649024).

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

1329785856 is an equidigital number, since it uses as much as digits as its factorization.

1329785856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6907 (or 6883 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 54.

The square root of 1329785856 is about 36466.2289797012. The cubic root of 1329785856 is about 1099.6654233141.

The spelling of 1329785856 in words is "one billion, three hundred twenty-nine million, seven hundred eighty-five thousand, eight hundred fifty-six".