1279081728 has 108 divisors (see below), whose sum is σ = 3710381220. Its totient is φ = 423763968.

The previous prime is 1279081723. The next prime is 1279081747. The reversal of 1279081728 is 8271809721.

It can be written as a sum of positive squares in 2 ways, for example, as 970447104 + 308634624 = 31152^2 + 17568^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1279081723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 396988 + ... + 400196.

Almost surely, 2^1279081728 is an apocalyptic number.

1279081728 is a gapful number since it is divisible by the number (18) 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 1279081728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1855190610).

1279081728 is an abundant number, since it is smaller than the sum of its proper divisors (2431299492).

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

1279081728 is a wasteful number, since it uses less digits than its factorization.

1279081728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3404 (or 3387 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 45.

The square root of 1279081728 is about 35764.2520961924. The cubic root of 1279081728 is about 1085.5073414308.

The spelling of 1279081728 in words is "one billion, two hundred seventy-nine million, eighty-one thousand, seven hundred twenty-eight".