1278851264 has 28 divisors (see below), whose sum is σ = 2552937744. Its totient is φ = 635591424.

The previous prime is 1278851263. The next prime is 1278851281. The reversal of 1278851264 is 4621588721.

It is not an unprimeable number, because it can be changed into a prime (1278851263) 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 3 ways as a sum of consecutive naturals, for example, 49139 + ... + 70514.

It is an arithmetic number, because the mean of its divisors is an integer number (91176348).

Almost surely, 2^1278851264 is an apocalyptic number.

It is an amenable number.

1278851264 is a deficient number, since it is larger than the sum of its proper divisors (1274086480).

1278851264 is a wasteful number, since it uses less digits than its factorization.

1278851264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119832 (or 119822 counting only the distinct ones).

The product of its digits is 215040, while the sum is 44.

The square root of 1278851264 is about 35761.0299627961. The cubic root of 1278851264 is about 1085.4421422114.

The spelling of 1278851264 in words is "one billion, two hundred seventy-eight million, eight hundred fifty-one thousand, two hundred sixty-four".