1328897664 has 80 divisors (see below), whose sum is σ = 3954808770. Its totient is φ = 442962432.

The previous prime is 1328897641. The next prime is 1328897681. The reversal of 1328897664 is 4667988231.

It can be written as a sum of positive squares in only one way, i.e., 675584064 + 653313600 = 25992^2 + 25560^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 1328897664.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 53719 + ... + 74454.

Almost surely, 2^1328897664 is an apocalyptic number.

It is an amenable number.

1328897664 is an abundant number, since it is smaller than the sum of its proper divisors (2625911106).

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

1328897664 is an equidigital number, since it uses as much as digits as its factorization.

1328897664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128199 (or 128178 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The square root of 1328897664 is about 36454.0486640373. The cubic root of 1328897664 is about 1099.4205388806.

The spelling of 1328897664 in words is "one billion, three hundred twenty-eight million, eight hundred ninety-seven thousand, six hundred sixty-four".