478218073 has 2 divisors, whose sum is σ = 478218074. Its totient is φ = 478218072.

The previous prime is 478218043. The next prime is 478218077. The reversal of 478218073 is 370812874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 478209424 + 8649 = 21868^2 + 93^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-478218073 is a prime.

It is not a weakly prime, because it can be changed into another prime (478218077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239109036 + 239109037.

It is an arithmetic number, because the mean of its divisors is an integer number (239109037).

Almost surely, 2^478218073 is an apocalyptic number.

It is an amenable number.

478218073 is a deficient number, since it is larger than the sum of its proper divisors (1).

478218073 is an equidigital number, since it uses as much as digits as its factorization.

478218073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 478218073 is about 21868.1977538159. The cubic root of 478218073 is about 782.0034367538.

The spelling of 478218073 in words is "four hundred seventy-eight million, two hundred eighteen thousand, seventy-three".