278716279 has 2 divisors, whose sum is σ = 278716280. Its totient is φ = 278716278.

The previous prime is 278716261. The next prime is 278716297. The reversal of 278716279 is 972617872.

Together with next prime (278716297) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (278716261) and next prime (278716297).

It is a cyclic number.

It is not a de Polignac number, because 278716279 - 2¹¹ = 278714231 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278716219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139358139 + 139358140.

It is an arithmetic number, because the mean of its divisors is an integer number (139358140).

Almost surely, 2^278716279 is an apocalyptic number.

278716279 is a deficient number, since it is larger than the sum of its proper divisors (1).

278716279 is an equidigital number, since it uses as much as digits as its factorization.

278716279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 592704, while the sum is 49.

The square root of 278716279 is about 16694.7979622396. The cubic root of 278716279 is about 653.2119358007.

The spelling of 278716279 in words is "two hundred seventy-eight million, seven hundred sixteen thousand, two hundred seventy-nine".