278828233 has 2 divisors, whose sum is σ = 278828234. Its totient is φ = 278828232.

The previous prime is 278828227. The next prime is 278828257. The reversal of 278828233 is 332828872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 277822224 + 1006009 = 16668^2 + 1003^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278828233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 278828233.

It is not a weakly prime, because it can be changed into another prime (278828293) 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, 139414116 + 139414117.

It is an arithmetic number, because the mean of its divisors is an integer number (139414117).

Almost surely, 2^278828233 is an apocalyptic number.

It is an amenable number.

278828233 is a deficient number, since it is larger than the sum of its proper divisors (1).

278828233 is an equidigital number, since it uses as much as digits as its factorization.

278828233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 43.

The square root of 278828233 is about 16698.1505862176. The cubic root of 278828233 is about 653.2993842267.

The spelling of 278828233 in words is "two hundred seventy-eight million, eight hundred twenty-eight thousand, two hundred thirty-three".