1328382720 has 864 divisors, whose sum is σ = 6024076800. Its totient is φ = 270729216.

The previous prime is 1328382683. The next prime is 1328382791. The reversal of 1328382720 is 272838231.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (864).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 69914871 + ... + 69914889.

Almost surely, 2^1328382720 is an apocalyptic number.

1328382720 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 1328382720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3012038400).

1328382720 is an abundant number, since it is smaller than the sum of its proper divisors (4695694080).

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

1328382720 is a wasteful number, since it uses less digits than its factorization.

1328382720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 1328382720 is about 36446.9850604957. The cubic root of 1328382720 is about 1099.2785131081.

The spelling of 1328382720 in words is "one billion, three hundred twenty-eight million, three hundred eighty-two thousand, seven hundred twenty".