278628460638587 has 2 divisors, whose sum is σ = 278628460638588. Its totient is φ = 278628460638586.

The previous prime is 278628460638569. The next prime is 278628460638607. The reversal of 278628460638587 is 785836064826872.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278628460638587 is a prime.

It is not a weakly prime, because it can be changed into another prime (278628460638887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139314230319293 + 139314230319294.

It is an arithmetic number, because the mean of its divisors is an integer number (139314230319294).

Almost surely, 2^{278628460638587} is an apocalyptic number.

278628460638587 is a deficient number, since it is larger than the sum of its proper divisors (1).

278628460638587 is an equidigital number, since it uses as much as digits as its factorization.

278628460638587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10404495360, while the sum is 80.

The spelling of 278628460638587 in words is "two hundred seventy-eight trillion, six hundred twenty-eight billion, four hundred sixty million, six hundred thirty-eight thousand, five hundred eighty-seven".