1328730923520 has 1920 divisors, whose sum is σ = 6543976158720. Its totient is φ = 239798845440.

The previous prime is 1328730923489. The next prime is 1328730923551. The reversal of 1328730923520 is 253290378231.

1328730923520 is a `hidden beast` number, since 1 + 3 + 2 + 8 + 7 + 30 + 92 + 3 + 520 = 666.

It is an interprime number because it is at equal distance from previous prime (1328730923489) and next prime (1328730923551).

It is a tau number, because it is divible by the number of its divisors (1920).

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

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 392069986 + ... + 392073374.

It is an arithmetic number, because the mean of its divisors is an integer number (3408320916).

Almost surely, 2^{1328730923520} is an apocalyptic number.

1328730923520 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 1328730923520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3271988079360).

1328730923520 is an abundant number, since it is smaller than the sum of its proper divisors (5215245235200).

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

1328730923520 is a wasteful number, since it uses less digits than its factorization.

1328730923520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3466 (or 3447 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 1328730923520 in words is "one trillion, three hundred twenty-eight billion, seven hundred thirty million, nine hundred twenty-three thousand, five hundred twenty".