1279779264 has 140 divisors (see below), whose sum is σ = 3818269224. Its totient is φ = 423830016.

The previous prime is 1279779253. The next prime is 1279779299. The reversal of 1279779264 is 4629779721.

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 1279779264.

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 896119 + ... + 897545.

Almost surely, 2^1279779264 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 1279779264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1909134612).

1279779264 is an abundant number, since it is smaller than the sum of its proper divisors (2538489960).

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

1279779264 is a wasteful number, since it uses less digits than its factorization.

1279779264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624 (or 1605 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 54.

The square root of 1279779264 is about 35774.0026276065. The cubic root of 1279779264 is about 1085.7046295408.

The spelling of 1279779264 in words is "one billion, two hundred seventy-nine million, seven hundred seventy-nine thousand, two hundred sixty-four".