478138663 has 4 divisors (see below), whose sum is σ = 478343880. Its totient is φ = 477933448.

The previous prime is 478138657. The next prime is 478138673. The reversal of 478138663 is 366831874.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-478138663 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 (478138613) 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, 99073 + ... + 103786.

It is an arithmetic number, because the mean of its divisors is an integer number (119585970).

Almost surely, 2^478138663 is an apocalyptic number.

478138663 is a deficient number, since it is larger than the sum of its proper divisors (205217).

478138663 is a wasteful number, since it uses less digits than its factorization.

478138663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205216.

The product of its digits is 580608, while the sum is 46.

The square root of 478138663 is about 21866.3820281271. The cubic root of 478138663 is about 781.9601494378.

The spelling of 478138663 in words is "four hundred seventy-eight million, one hundred thirty-eight thousand, six hundred sixty-three".