478218887 has 2 divisors, whose sum is σ = 478218888. Its totient is φ = 478218886.

The previous prime is 478218773. The next prime is 478218889. The reversal of 478218887 is 788812874.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 478218887 - 2²⁴ = 461441671 is a prime.

Together with 478218889, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (478218889) 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, 239109443 + 239109444.

It is an arithmetic number, because the mean of its divisors is an integer number (239109444).

Almost surely, 2^478218887 is an apocalyptic number.

478218887 is a deficient number, since it is larger than the sum of its proper divisors (1).

478218887 is an equidigital number, since it uses as much as digits as its factorization.

478218887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1605632, while the sum is 53.

The square root of 478218887 is about 21868.2163653097. The cubic root of 478218887 is about 782.0038804499.

The spelling of 478218887 in words is "four hundred seventy-eight million, two hundred eighteen thousand, eight hundred eighty-seven".