1278768768 has 64 divisors (see below), whose sum is σ = 3418525920. Its totient is φ = 423521280.

The previous prime is 1278768763. The next prime is 1278768791. The reversal of 1278768768 is 8678678721.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (1278768763) 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, 49683 + ... + 70893.

Almost surely, 2^1278768768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1278768768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1709262960).

1278768768 is an abundant number, since it is smaller than the sum of its proper divisors (2139757152).

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

1278768768 is a wasteful number, since it uses less digits than its factorization.

1278768768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21385 (or 21373 counting only the distinct ones).

The product of its digits is 12644352, while the sum is 60.

The square root of 1278768768 is about 35759.8765098539. The cubic root of 1278768768 is about 1085.4188018478.

The spelling of 1278768768 in words is "one billion, two hundred seventy-eight million, seven hundred sixty-eight thousand, seven hundred sixty-eight".