278364263 has 2 divisors, whose sum is σ = 278364264. Its totient is φ = 278364262.

The previous prime is 278364227. The next prime is 278364277. The reversal of 278364263 is 362463872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 278364263 - 2⁶ = 278364199 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 278364263.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278364563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139182131 + 139182132.

It is an arithmetic number, because the mean of its divisors is an integer number (139182132).

Almost surely, 2^278364263 is an apocalyptic number.

278364263 is a deficient number, since it is larger than the sum of its proper divisors (1).

278364263 is an equidigital number, since it uses as much as digits as its factorization.

278364263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 41.

The square root of 278364263 is about 16684.2519460718. The cubic root of 278364263 is about 652.9368197985.

The spelling of 278364263 in words is "two hundred seventy-eight million, three hundred sixty-four thousand, two hundred sixty-three".