278390012012 has 24 divisors (see below), whose sum is σ = 557982598656. Its totient is φ = 119052310608.

The previous prime is 278390012009. The next prime is 278390012027. The reversal of 278390012012 is 210210093872.

It is an unprimeable number.

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, 10724078 + ... + 10750005.

It is an arithmetic number, because the mean of its divisors is an integer number (23249274944).

Almost surely, 2^278390012012 is an apocalyptic number.

It is an amenable number.

278390012012 is an abundant number, since it is smaller than the sum of its proper divisors (279592586644).

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

278390012012 is a wasteful number, since it uses less digits than its factorization.

278390012012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21474557 (or 21474555 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The spelling of 278390012012 in words is "two hundred seventy-eight billion, three hundred ninety million, twelve thousand, twelve".