1278497079678 has 32 divisors (see below), whose sum is σ = 3147069735936. Its totient is φ = 337186042848.

The previous prime is 1278497079667. The next prime is 1278497079679. The reversal of 1278497079678 is 8769707948721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278497079679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1170784326 + ... + 1170785417.

It is an arithmetic number, because the mean of its divisors is an integer number (98345929248).

Almost surely, 2^{1278497079678} is an apocalyptic number.

1278497079678 is an abundant number, since it is smaller than the sum of its proper divisors (1868572656258).

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

1278497079678 is a wasteful number, since it uses less digits than its factorization.

1278497079678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2341569768.

The product of its (nonzero) digits is 597445632, while the sum is 75.

The spelling of 1278497079678 in words is "one trillion, two hundred seventy-eight billion, four hundred ninety-seven million, seventy-nine thousand, six hundred seventy-eight".