278780563 has 2 divisors, whose sum is σ = 278780564. Its totient is φ = 278780562.

The previous prime is 278780543. The next prime is 278780599. The reversal of 278780563 is 365087872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 278780563 - 2¹³ = 278772371 is a prime.

It is not a weakly prime, because it can be changed into another prime (278780543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139390281 + 139390282.

It is an arithmetic number, because the mean of its divisors is an integer number (139390282).

Almost surely, 2^278780563 is an apocalyptic number.

278780563 is a deficient number, since it is larger than the sum of its proper divisors (1).

278780563 is an equidigital number, since it uses as much as digits as its factorization.

278780563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 564480, while the sum is 46.

The square root of 278780563 is about 16696.7231216188. The cubic root of 278780563 is about 653.2621515593.

The spelling of 278780563 in words is "two hundred seventy-eight million, seven hundred eighty thousand, five hundred sixty-three".