1278928047 has 8 divisors (see below), whose sum is σ = 1746828720. Its totient is φ = 831823040.

The previous prime is 1278927997. The next prime is 1278928069. The reversal of 1278928047 is 7408298721.

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

It is a cyclic number.

It is not a de Polignac number, because 1278928047 - 2⁶ = 1278927983 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1278927987 and 1278928005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278928447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5198772 + ... + 5199017.

It is an arithmetic number, because the mean of its divisors is an integer number (218353590).

Almost surely, 2^1278928047 is an apocalyptic number.

1278928047 is a deficient number, since it is larger than the sum of its proper divisors (467900673).

1278928047 is a wasteful number, since it uses less digits than its factorization.

1278928047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10397833.

The product of its (nonzero) digits is 451584, while the sum is 48.

The square root of 1278928047 is about 35762.1035035692. The cubic root of 1278928047 is about 1085.4638653099.

The spelling of 1278928047 in words is "one billion, two hundred seventy-eight million, nine hundred twenty-eight thousand, forty-seven".