1263917728 has 24 divisors (see below), whose sum is σ = 2492435988. Its totient is φ = 630918144.

The previous prime is 1263917723. The next prime is 1263917741. The reversal of 1263917728 is 8277193621.

It can be written as a sum of positive squares in 2 ways, for example, as 1081883664 + 182034064 = 32892^2 + 13492^2 .

It is not an unprimeable number, because it can be changed into a prime (1263917723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12601 + ... + 51832.

Almost surely, 2^1263917728 is an apocalyptic number.

It is an amenable number.

1263917728 is a deficient number, since it is larger than the sum of its proper divisors (1228518260).

1263917728 is an equidigital number, since it uses as much as digits as its factorization.

1263917728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65056 (or 65048 counting only the distinct ones).

The product of its digits is 254016, while the sum is 46.

The square root of 1263917728 is about 35551.6206100369. The cubic root of 1263917728 is about 1081.2005761854.

The spelling of 1263917728 in words is "one billion, two hundred sixty-three million, nine hundred seventeen thousand, seven hundred twenty-eight".