278470823 has 2 divisors, whose sum is σ = 278470824. Its totient is φ = 278470822.

The previous prime is 278470771. The next prime is 278470831. The reversal of 278470823 is 328074872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 278470823 - 2¹⁰ = 278469799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278470873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139235411 + 139235412.

It is an arithmetic number, because the mean of its divisors is an integer number (139235412).

Almost surely, 2^278470823 is an apocalyptic number.

278470823 is a deficient number, since it is larger than the sum of its proper divisors (1).

278470823 is an equidigital number, since it uses as much as digits as its factorization.

278470823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150528, while the sum is 41.

The square root of 278470823 is about 16687.4450710706. The cubic root of 278470823 is about 653.0201255966.

The spelling of 278470823 in words is "two hundred seventy-eight million, four hundred seventy thousand, eight hundred twenty-three".