1329746220 has 240 divisors, whose sum is σ = 4619172096. Its totient is φ = 317520000.

The previous prime is 1329746183. The next prime is 1329746267. The reversal of 1329746220 is 226479231.

1329746220 is a `hidden beast` number, since 1 + 3 + 29 + 7 + 4 + 622 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1264695 + ... + 1265745.

Almost surely, 2^1329746220 is an apocalyptic number.

1329746220 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 1329746220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2309586048).

1329746220 is an abundant number, since it is smaller than the sum of its proper divisors (3289425876).

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

1329746220 is a wasteful number, since it uses less digits than its factorization.

1329746220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154 (or 1143 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 1329746220 is about 36465.6855139184. The cubic root of 1329746220 is about 1099.6544975520.

The spelling of 1329746220 in words is "one billion, three hundred twenty-nine million, seven hundred forty-six thousand, two hundred twenty".