1268789705 has 8 divisors (see below), whose sum is σ = 1522847304. Its totient is φ = 1014832000.

The previous prime is 1268789699. The next prime is 1268789707. The reversal of 1268789705 is 5079878621.

It can be written as a sum of positive squares in 4 ways, for example, as 23193856 + 1245595849 = 4816^2 + 35293^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1268789705 - 2²⁰ = 1267741129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1268789707) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6605 + ... + 50805.

It is an arithmetic number, because the mean of its divisors is an integer number (190355913).

Almost surely, 2^1268789705 is an apocalyptic number.

It is an amenable number.

1268789705 is a deficient number, since it is larger than the sum of its proper divisors (254057599).

1268789705 is an equidigital number, since it uses as much as digits as its factorization.

1268789705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49947.

The product of its (nonzero) digits is 1693440, while the sum is 53.

The square root of 1268789705 is about 35620.0744665140. The cubic root of 1268789705 is about 1082.5880163185.

The spelling of 1268789705 in words is "one billion, two hundred sixty-eight million, seven hundred eighty-nine thousand, seven hundred five".