1328218801920 has 576 divisors, whose sum is σ = 5072536586880. Its totient is φ = 327883161600.

The previous prime is 1328218801913. The next prime is 1328218801997. The reversal of 1328218801920 is 291088128231.

1328218801920 is a `hidden beast` number, since 1 + 3 + 282 + 188 + 0 + 192 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 35820190 + ... + 35857250.

It is an arithmetic number, because the mean of its divisors is an integer number (8806487130).

Almost surely, 2^{1328218801920} is an apocalyptic number.

1328218801920 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 1328218801920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2536268293440).

1328218801920 is an abundant number, since it is smaller than the sum of its proper divisors (3744317784960).

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

1328218801920 is a wasteful number, since it uses less digits than its factorization.

1328218801920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37169 (or 37149 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The spelling of 1328218801920 in words is "one trillion, three hundred twenty-eight billion, two hundred eighteen million, eight hundred one thousand, nine hundred twenty".