278480729 has 2 divisors, whose sum is σ = 278480730. Its totient is φ = 278480728.

The previous prime is 278480669. The next prime is 278480747. The reversal of 278480729 is 927084872.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 278055625 + 425104 = 16675^2 + 652^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278480729 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (278480749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139240364 + 139240365.

It is an arithmetic number, because the mean of its divisors is an integer number (139240365).

Almost surely, 2^278480729 is an apocalyptic number.

It is an amenable number.

278480729 is a deficient number, since it is larger than the sum of its proper divisors (1).

278480729 is an equidigital number, since it uses as much as digits as its factorization.

278480729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 278480729 is about 16687.7418783968. The cubic root of 278480729 is about 653.0278687664.

The spelling of 278480729 in words is "two hundred seventy-eight million, four hundred eighty thousand, seven hundred twenty-nine".