278103646428 has 12 divisors (see below), whose sum is σ = 648908508360. Its totient is φ = 92701215472.

The previous prime is 278103646369. The next prime is 278103646433. The reversal of 278103646428 is 824646301872.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

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, 11587651923 + ... + 11587651946.

It is an arithmetic number, because the mean of its divisors is an integer number (54075709030).

Almost surely, 2^278103646428 is an apocalyptic number.

It is an amenable number.

278103646428 is an abundant number, since it is smaller than the sum of its proper divisors (370804861932).

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

278103646428 is a wasteful number, since it uses less digits than its factorization.

278103646428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23175303876 (or 23175303874 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 51.

The spelling of 278103646428 in words is "two hundred seventy-eight billion, one hundred three million, six hundred forty-six thousand, four hundred twenty-eight".