278907780778 has 16 divisors (see below), whose sum is σ = 472132294560. Its totient is φ = 122404668400.

The previous prime is 278907780743. The next prime is 278907780791. The reversal of 278907780778 is 877087709872.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218579128 + ... + 218580403.

It is an arithmetic number, because the mean of its divisors is an integer number (29508268410).

Almost surely, 2^278907780778 is an apocalyptic number.

278907780778 is a deficient number, since it is larger than the sum of its proper divisors (193224513782).

278907780778 is a wasteful number, since it uses less digits than its factorization.

278907780778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437159573.

The product of its (nonzero) digits is 154893312, while the sum is 70.

The spelling of 278907780778 in words is "two hundred seventy-eight billion, nine hundred seven million, seven hundred eighty thousand, seven hundred seventy-eight".