478643218 has 4 divisors (see below), whose sum is σ = 717964830. Its totient is φ = 239321608.

The previous prime is 478643197. The next prime is 478643219. The reversal of 478643218 is 812346874.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 337199769 + 141443449 = 18363^2 + 11893^2 .

It is not an unprimeable number, because it can be changed into a prime (478643219) 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, 119660803 + ... + 119660806.

Almost surely, 2^478643218 is an apocalyptic number.

478643218 is a deficient number, since it is larger than the sum of its proper divisors (239321612).

478643218 is a wasteful number, since it uses less digits than its factorization.

478643218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239321611.

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

The square root of 478643218 is about 21877.9162170441. The cubic root of 478643218 is about 782.2351067777.

The spelling of 478643218 in words is "four hundred seventy-eight million, six hundred forty-three thousand, two hundred eighteen".