1279311728 has 10 divisors (see below), whose sum is σ = 2478666504. Its totient is φ = 639655856.

The previous prime is 1279311653. The next prime is 1279311731. The reversal of 1279311728 is 8271139721.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39978476 + ... + 39978507.

Almost surely, 2^1279311728 is an apocalyptic number.

It is an amenable number.

1279311728 is a deficient number, since it is larger than the sum of its proper divisors (1199354776).

1279311728 is an equidigital number, since it uses as much as digits as its factorization.

1279311728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79956991 (or 79956985 counting only the distinct ones).

The product of its digits is 42336, while the sum is 41.

The square root of 1279311728 is about 35767.4674529802. The cubic root of 1279311728 is about 1085.5724015751.

The spelling of 1279311728 in words is "one billion, two hundred seventy-nine million, three hundred eleven thousand, seven hundred twenty-eight".