1320128664 has 64 divisors (see below), whose sum is σ = 3539635200. Its totient is φ = 409009536.

The previous prime is 1320128653. The next prime is 1320128699. The reversal of 1320128664 is 4668210231.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3144 + ... + 51479.

It is an arithmetic number, because the mean of its divisors is an integer number (55306800).

Almost surely, 2^1320128664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1320128664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1769817600).

1320128664 is an abundant number, since it is smaller than the sum of its proper divisors (2219506536).

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

1320128664 is a wasteful number, since it uses less digits than its factorization.

1320128664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54704 (or 54700 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 1320128664 is about 36333.5748860472. The cubic root of 1320128664 is about 1096.9969505988.

Adding to 1320128664 its reverse (4668210231), we get a palindrome (5988338895).

The spelling of 1320128664 in words is "one billion, three hundred twenty million, one hundred twenty-eight thousand, six hundred sixty-four".