278368247 has 2 divisors, whose sum is σ = 278368248. Its totient is φ = 278368246.

The previous prime is 278368231. The next prime is 278368249. The reversal of 278368247 is 742863872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 278368247 - 2⁴ = 278368231 is a prime.

Together with 278368249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278368249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139184123 + 139184124.

It is an arithmetic number, because the mean of its divisors is an integer number (139184124).

Almost surely, 2^278368247 is an apocalyptic number.

278368247 is a deficient number, since it is larger than the sum of its proper divisors (1).

278368247 is an equidigital number, since it uses as much as digits as its factorization.

278368247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 903168, while the sum is 47.

The square root of 278368247 is about 16684.3713396699. The cubic root of 278368247 is about 652.9399347672.

The spelling of 278368247 in words is "two hundred seventy-eight million, three hundred sixty-eight thousand, two hundred forty-seven".