1278888789 has 8 divisors (see below), whose sum is σ = 1706899360. Its totient is φ = 851735376.

The previous prime is 1278888773. The next prime is 1278888791. The reversal of 1278888789 is 9878888721.

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

It is not a de Polignac number, because 1278888789 - 2⁴ = 1278888773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278888889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210799 + ... + 216780.

It is an arithmetic number, because the mean of its divisors is an integer number (213362420).

Almost surely, 2^1278888789 is an apocalyptic number.

It is an amenable number.

1278888789 is a deficient number, since it is larger than the sum of its proper divisors (428010571).

1278888789 is an equidigital number, since it uses as much as digits as its factorization.

1278888789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428579.

The product of its digits is 28901376, while the sum is 66.

The square root of 1278888789 is about 35761.5546222476. The cubic root of 1278888789 is about 1085.4527587231.

The spelling of 1278888789 in words is "one billion, two hundred seventy-eight million, eight hundred eighty-eight thousand, seven hundred eighty-nine".