1288721706 has 16 divisors (see below), whose sum is σ = 2612751744. Its totient is φ = 423689184.

The previous prime is 1288721701. The next prime is 1288721743. The reversal of 1288721706 is 6071278821.

It is not an unprimeable number, because it can be changed into a prime (1288721701) 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, 1470706 + ... + 1471581.

It is an arithmetic number, because the mean of its divisors is an integer number (163296984).

Almost surely, 2^1288721706 is an apocalyptic number.

1288721706 is an abundant number, since it is smaller than the sum of its proper divisors (1324030038).

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

1288721706 is a wasteful number, since it uses less digits than its factorization.

1288721706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2942365.

The product of its (nonzero) digits is 75264, while the sum is 42.

The square root of 1288721706 is about 35898.7702574893. The cubic root of 1288721706 is about 1088.2275449728.

The spelling of 1288721706 in words is "one billion, two hundred eighty-eight million, seven hundred twenty-one thousand, seven hundred six".