278228023 has 2 divisors, whose sum is σ = 278228024. Its totient is φ = 278228022.

The previous prime is 278228003. The next prime is 278228051. The reversal of 278228023 is 320822872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 278228023 - 2²¹ = 276130871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 278228023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278228003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139114011 + 139114012.

It is an arithmetic number, because the mean of its divisors is an integer number (139114012).

Almost surely, 2^278228023 is an apocalyptic number.

278228023 is a deficient number, since it is larger than the sum of its proper divisors (1).

278228023 is an equidigital number, since it uses as much as digits as its factorization.

278228023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 278228023 is about 16680.1685543042. The cubic root of 278228023 is about 652.8302799864.

The spelling of 278228023 in words is "two hundred seventy-eight million, two hundred twenty-eight thousand, twenty-three".