1278863968 has 24 divisors (see below), whose sum is σ = 2529067968. Its totient is φ = 636561024.

The previous prime is 1278863959. The next prime is 1278863969. The reversal of 1278863968 is 8693688721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278863969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82471 + ... + 96742.

It is an arithmetic number, because the mean of its divisors is an integer number (105377832).

Almost surely, 2^1278863968 is an apocalyptic number.

It is an amenable number.

1278863968 is a deficient number, since it is larger than the sum of its proper divisors (1250204000).

1278863968 is a wasteful number, since it uses less digits than its factorization.

1278863968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179446 (or 179438 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 58.

The square root of 1278863968 is about 35761.2075858744. The cubic root of 1278863968 is about 1085.4457364296.

The spelling of 1278863968 in words is "one billion, two hundred seventy-eight million, eight hundred sixty-three thousand, nine hundred sixty-eight".