1268978018 has 32 divisors (see below), whose sum is σ = 2413393920. Its totient is φ = 486023760.

The previous prime is 1268978017. The next prime is 1268978021. The reversal of 1268978018 is 8108798621.

It is a super-2 number, since 2×1268978018² = 3220610420334416648, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1268978017) 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 15 ways as a sum of consecutive naturals, for example, 60746 + ... + 78917.

It is an arithmetic number, because the mean of its divisors is an integer number (75418560).

Almost surely, 2^1268978018 is an apocalyptic number.

1268978018 is a deficient number, since it is larger than the sum of its proper divisors (1144415902).

1268978018 is a wasteful number, since it uses less digits than its factorization.

1268978018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139742.

The product of its (nonzero) digits is 387072, while the sum is 50.

The square root of 1268978018 is about 35622.7177233855. The cubic root of 1268978018 is about 1082.6415726883.

The spelling of 1268978018 in words is "one billion, two hundred sixty-eight million, nine hundred seventy-eight thousand, eighteen".