1279332864 has 120 divisors (see below), whose sum is σ = 3853092672. Its totient is φ = 407869440.

The previous prime is 1279332829. The next prime is 1279332889. The reversal of 1279332864 is 4682339721.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99949 + ... + 112019.

Almost surely, 2^1279332864 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 1279332864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1926546336).

1279332864 is an abundant number, since it is smaller than the sum of its proper divisors (2573759808).

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

1279332864 is a wasteful number, since it uses less digits than its factorization.

1279332864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12118 (or 12099 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 1279332864 is about 35767.7629157877. The cubic root of 1279332864 is about 1085.5783799282.

The spelling of 1279332864 in words is "one billion, two hundred seventy-nine million, three hundred thirty-two thousand, eight hundred sixty-four".