478815138 has 40 divisors (see below), whose sum is σ = 1099084140. Its totient is φ = 155710080.

The previous prime is 478815133. The next prime is 478815157. The reversal of 478815138 is 831518874.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 469285569 + 9529569 = 21663^2 + 3087^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 478815093 and 478815102.

It is not an unprimeable number, because it can be changed into a prime (478815133) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 29403 + ... + 42686.

Almost surely, 2^478815138 is an apocalyptic number.

478815138 is an abundant number, since it is smaller than the sum of its proper divisors (620269002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

478815138 is a wasteful number, since it uses less digits than its factorization.

478815138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72144 (or 72135 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 478815138 is about 21881.8449404980. The cubic root of 478815138 is about 782.3287504748.

The spelling of 478815138 in words is "four hundred seventy-eight million, eight hundred fifteen thousand, one hundred thirty-eight".