8478240517 has 4 divisors (see below), whose sum is σ = 8487908716. Its totient is φ = 8468572320.

The previous prime is 8478240503. The next prime is 8478240521. The reversal of 8478240517 is 7150428748.

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 6459176161 + 2019064356 = 80369^2 + 44934^2 .

It is a cyclic number.

It is not a de Polignac number, because 8478240517 - 2²⁷ = 8344022789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8478240217) 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, 4832784 + ... + 4834537.

It is an arithmetic number, because the mean of its divisors is an integer number (2121977179).

Almost surely, 2^8478240517 is an apocalyptic number.

It is an amenable number.

8478240517 is a deficient number, since it is larger than the sum of its proper divisors (9668199).

8478240517 is an equidigital number, since it uses as much as digits as its factorization.

8478240517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9668198.

The product of its (nonzero) digits is 501760, while the sum is 46.

The square root of 8478240517 is about 92077.3615879604. The cubic root of 8478240517 is about 2039.0845980270.

The spelling of 8478240517 in words is "eight billion, four hundred seventy-eight million, two hundred forty thousand, five hundred seventeen".