1320638268 has 48 divisors (see below), whose sum is σ = 3270716064. Its totient is φ = 413306880.

The previous prime is 1320638261. The next prime is 1320638303. The reversal of 1320638268 is 8628360231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320638261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78196 + ... + 93572.

It is an arithmetic number, because the mean of its divisors is an integer number (68139918).

Almost surely, 2^1320638268 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 1320638268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1635358032).

1320638268 is an abundant number, since it is smaller than the sum of its proper divisors (1950077796).

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

1320638268 is a wasteful number, since it uses less digits than its factorization.

1320638268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15822 (or 15820 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 1320638268 is about 36340.5870618514. The cubic root of 1320638268 is about 1097.1380888910.

Adding to 1320638268 its reverse (8628360231), we get a palindrome (9948998499).

The spelling of 1320638268 in words is "one billion, three hundred twenty million, six hundred thirty-eight thousand, two hundred sixty-eight".