1278988668 has 36 divisors (see below), whose sum is σ = 3241475328. Its totient is φ = 425211840.

The previous prime is 1278988643. The next prime is 1278988681. The reversal of 1278988668 is 8668898721.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32593 + ... + 60168.

Almost surely, 2^1278988668 is an apocalyptic number.

1278988668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1278988668 is an abundant number, since it is smaller than the sum of its proper divisors (1962486660).

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

1278988668 is a wasteful number, since it uses less digits than its factorization.

1278988668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93154 (or 93149 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 63.

The square root of 1278988668 is about 35762.9510527305. The cubic root of 1278988668 is about 1085.4810153145.

The spelling of 1278988668 in words is "one billion, two hundred seventy-eight million, nine hundred eighty-eight thousand, six hundred sixty-eight".