278320963 has 2 divisors, whose sum is σ = 278320964. Its totient is φ = 278320962.

The previous prime is 278320961. The next prime is 278321011. The reversal of 278320963 is 369023872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 278320963 - 2¹ = 278320961 is a prime.

Together with 278320961, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (278320961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139160481 + 139160482.

It is an arithmetic number, because the mean of its divisors is an integer number (139160482).

Almost surely, 2^278320963 is an apocalyptic number.

278320963 is a deficient number, since it is larger than the sum of its proper divisors (1).

278320963 is an equidigital number, since it uses as much as digits as its factorization.

278320963 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 278320963 is about 16682.9542647578. The cubic root of 278320963 is about 652.9029629257.

The spelling of 278320963 in words is "two hundred seventy-eight million, three hundred twenty thousand, nine hundred sixty-three".