1279961728 has 32 divisors (see below), whose sum is σ = 2632187520. Its totient is φ = 619334400.

The previous prime is 1279961723. The next prime is 1279961741. The reversal of 1279961728 is 8271699721.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (1279961723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157318 + ... + 165253.

It is an arithmetic number, because the mean of its divisors is an integer number (82255860).

Almost surely, 2^1279961728 is an apocalyptic number.

It is an amenable number.

1279961728 is an abundant number, since it is smaller than the sum of its proper divisors (1352225792).

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

1279961728 is an equidigital number, since it uses as much as digits as its factorization.

1279961728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322616 (or 322604 counting only the distinct ones).

The product of its digits is 762048, while the sum is 52.

The square root of 1279961728 is about 35776.5527685382. The cubic root of 1279961728 is about 1085.7562250519.

The spelling of 1279961728 in words is "one billion, two hundred seventy-nine million, nine hundred sixty-one thousand, seven hundred twenty-eight".