278765323 has 2 divisors, whose sum is σ = 278765324. Its totient is φ = 278765322.

The previous prime is 278765233. The next prime is 278765341. The reversal of 278765323 is 323567872.

Together with previous prime (278765233) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278765323 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 278765323.

It is not a weakly prime, because it can be changed into another prime (278765623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139382661 + 139382662.

It is an arithmetic number, because the mean of its divisors is an integer number (139382662).

Almost surely, 2^278765323 is an apocalyptic number.

278765323 is a deficient number, since it is larger than the sum of its proper divisors (1).

278765323 is an equidigital number, since it uses as much as digits as its factorization.

278765323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 43.

The square root of 278765323 is about 16696.2667384059. The cubic root of 278765323 is about 653.2502474575.

The spelling of 278765323 in words is "two hundred seventy-eight million, seven hundred sixty-five thousand, three hundred twenty-three".