278888879 has 2 divisors, whose sum is σ = 278888880. Its totient is φ = 278888878.

The previous prime is 278888867. The next prime is 278888891. The reversal of 278888879 is 978888872.

It is a balanced prime because it is at equal distance from previous prime (278888867) and next prime (278888891).

It is a cyclic number.

It is not a de Polignac number, because 278888879 - 2¹² = 278884783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278888839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139444439 + 139444440.

It is an arithmetic number, because the mean of its divisors is an integer number (139444440).

Almost surely, 2^278888879 is an apocalyptic number.

278888879 is a deficient number, since it is larger than the sum of its proper divisors (1).

278888879 is an equidigital number, since it uses as much as digits as its factorization.

278888879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28901376, while the sum is 65.

The square root of 278888879 is about 16699.9664370920. The cubic root of 278888879 is about 653.3467456696.

The spelling of 278888879 in words is "two hundred seventy-eight million, eight hundred eighty-eight thousand, eight hundred seventy-nine".