1278888609 has 8 divisors (see below), whose sum is σ = 1751271040. Its totient is φ = 829549296.

The previous prime is 1278888599. The next prime is 1278888701. The reversal of 1278888609 is 9068888721.

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

It is not a de Polignac number, because 1278888609 - 2⁴ = 1278888593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1278888509) 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, 5760649 + ... + 5760870.

It is an arithmetic number, because the mean of its divisors is an integer number (218908880).

Almost surely, 2^1278888609 is an apocalyptic number.

It is an amenable number.

1278888609 is a deficient number, since it is larger than the sum of its proper divisors (472382431).

1278888609 is a wasteful number, since it uses less digits than its factorization.

1278888609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11521559.

The product of its (nonzero) digits is 3096576, while the sum is 57.

The square root of 1278888609 is about 35761.5521055784. The cubic root of 1278888609 is about 1085.4527077982.

The spelling of 1278888609 in words is "one billion, two hundred seventy-eight million, eight hundred eighty-eight thousand, six hundred nine".