1278251716 has 24 divisors (see below), whose sum is σ = 2565952256. Its totient is φ = 545797440.

The previous prime is 1278251701. The next prime is 1278251717. The reversal of 1278251716 is 6171528721.

It is not an unprimeable number, because it can be changed into a prime (1278251717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76641 + ... + 91816.

Almost surely, 2^1278251716 is an apocalyptic number.

It is an amenable number.

1278251716 is an abundant number, since it is smaller than the sum of its proper divisors (1287700540).

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

1278251716 is a wasteful number, since it uses less digits than its factorization.

1278251716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168739 (or 168737 counting only the distinct ones).

The product of its digits is 47040, while the sum is 40.

The square root of 1278251716 is about 35752.6462796812. The cubic root of 1278251716 is about 1085.2724908979.

The spelling of 1278251716 in words is "one billion, two hundred seventy-eight million, two hundred fifty-one thousand, seven hundred sixteen".