478778717 has 4 divisors (see below), whose sum is σ = 485924736. Its totient is φ = 471632700.

The previous prime is 478778659. The next prime is 478778737. The reversal of 478778717 is 717877874.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 478778717 - 2⁶ = 478778653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478778737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3572909 + ... + 3573042.

It is an arithmetic number, because the mean of its divisors is an integer number (121481184).

Almost surely, 2^478778717 is an apocalyptic number.

It is an amenable number.

478778717 is a deficient number, since it is larger than the sum of its proper divisors (7146019).

478778717 is an equidigital number, since it uses as much as digits as its factorization.

478778717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7146018.

The product of its digits is 4302592, while the sum is 56.

The square root of 478778717 is about 21881.0127050829. The cubic root of 478778717 is about 782.3089140664.

The spelling of 478778717 in words is "four hundred seventy-eight million, seven hundred seventy-eight thousand, seven hundred seventeen".