478680217 has 4 divisors (see below), whose sum is σ = 478749796. Its totient is φ = 478610640.

The previous prime is 478680193. The next prime is 478680287. The reversal of 478680217 is 712086874.

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

It can be written as a sum of positive squares in 2 ways, for example, as 128391561 + 350288656 = 11331^2 + 18716^2 .

It is a cyclic number.

It is not a de Polignac number, because 478680217 - 2²³ = 470291609 is a prime.

It is a super-3 number, since 3×478680217³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (478680287) 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 in 3 ways as a sum of consecutive naturals, for example, 23178 + ... + 38659.

It is an arithmetic number, because the mean of its divisors is an integer number (119687449).

Almost surely, 2^478680217 is an apocalyptic number.

It is an amenable number.

478680217 is a deficient number, since it is larger than the sum of its proper divisors (69579).

478680217 is an equidigital number, since it uses as much as digits as its factorization.

478680217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69578.

The product of its (nonzero) digits is 150528, while the sum is 43.

The square root of 478680217 is about 21878.7617794061. The cubic root of 478680217 is about 782.2552617839.

The spelling of 478680217 in words is "four hundred seventy-eight million, six hundred eighty thousand, two hundred seventeen".