280478267 has 2 divisors, whose sum is σ = 280478268. Its totient is φ = 280478266.

The previous prime is 280478243. The next prime is 280478269. The reversal of 280478267 is 762874082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 280478267 - 2²⁴ = 263701051 is a prime.

Together with 280478269, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (280478269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140239133 + 140239134.

It is an arithmetic number, because the mean of its divisors is an integer number (140239134).

Almost surely, 2^280478267 is an apocalyptic number.

280478267 is a deficient number, since it is larger than the sum of its proper divisors (1).

280478267 is an equidigital number, since it uses as much as digits as its factorization.

280478267 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 301056, while the sum is 44.

The square root of 280478267 is about 16747.4853933359. The cubic root of 280478267 is about 654.5855366033.

The spelling of 280478267 in words is "two hundred eighty million, four hundred seventy-eight thousand, two hundred sixty-seven".