478172647 has 2 divisors, whose sum is σ = 478172648. Its totient is φ = 478172646.

The previous prime is 478172641. The next prime is 478172713. The reversal of 478172647 is 746271874.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-478172647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 478172597 and 478172606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (478172641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239086323 + 239086324.

It is an arithmetic number, because the mean of its divisors is an integer number (239086324).

Almost surely, 2^478172647 is an apocalyptic number.

478172647 is a deficient number, since it is larger than the sum of its proper divisors (1).

478172647 is an equidigital number, since it uses as much as digits as its factorization.

478172647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 526848, while the sum is 46.

The square root of 478172647 is about 21867.1590976057. The cubic root of 478172647 is about 781.9786750987.

The spelling of 478172647 in words is "four hundred seventy-eight million, one hundred seventy-two thousand, six hundred forty-seven".