1279678778278 has 8 divisors (see below), whose sum is σ = 1924865015760. Its totient is φ = 638057106360.

The previous prime is 1279678778251. The next prime is 1279678778297. The reversal of 1279678778278 is 8728778769721.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1279678778198 and 1279678778207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 891140493 + ... + 891141928.

It is an arithmetic number, because the mean of its divisors is an integer number (240608126970).

Almost surely, 2^{1279678778278} is an apocalyptic number.

1279678778278 is a deficient number, since it is larger than the sum of its proper divisors (645186237482).

1279678778278 is a wasteful number, since it uses less digits than its factorization.

1279678778278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782282782.

The product of its digits is 1858719744, while the sum is 79.

The spelling of 1279678778278 in words is "one trillion, two hundred seventy-nine billion, six hundred seventy-eight million, seven hundred seventy-eight thousand, two hundred seventy-eight".