1328708448 has 72 divisors (see below), whose sum is σ = 3918482568. Its totient is φ = 442900224.

The previous prime is 1328708419. The next prime is 1328708449. The reversal of 1328708448 is 8448078231.

1328708448 is a `hidden beast` number, since 132 + 8 + 70 + 8 + 448 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×1328708448² = 3530932279573137408, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328708449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77661 + ... + 93212.

It is an arithmetic number, because the mean of its divisors is an integer number (54423369).

Almost surely, 2^1328708448 is an apocalyptic number.

1328708448 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1328708448 is an abundant number, since it is smaller than the sum of its proper divisors (2589774120).

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

1328708448 is an equidigital number, since it uses as much as digits as its factorization.

1328708448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170898 (or 170878 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 45.

The square root of 1328708448 is about 36451.4533043609. The cubic root of 1328708448 is about 1099.3683558228.

The spelling of 1328708448 in words is "one billion, three hundred twenty-eight million, seven hundred eight thousand, four hundred forty-eight".