278056087 has 2 divisors, whose sum is σ = 278056088. Its totient is φ = 278056086.

The previous prime is 278056069. The next prime is 278056091. The reversal of 278056087 is 780650872.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278056087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278056067) by changing a digit.

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 as a sum of consecutive naturals, namely, 139028043 + 139028044.

It is an arithmetic number, because the mean of its divisors is an integer number (139028044).

Almost surely, 2^278056087 is an apocalyptic number.

278056087 is a deficient number, since it is larger than the sum of its proper divisors (1).

278056087 is an equidigital number, since it uses as much as digits as its factorization.

278056087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 278056087 is about 16675.0138530677. The cubic root of 278056087 is about 652.6957762137.

The spelling of 278056087 in words is "two hundred seventy-eight million, fifty-six thousand, eighty-seven".